Dear all,
Today while printing, I noticed that when the print head encounters a certain amount of resistance (such as uneven surfaces on the part), the print bed automatically moves down by approximately one layer's distance. Is this some kind of collision avoidance feature in the settings? Can it be turned off? Or is it more likely a mechanical issue with the printer?(seems not)
Thanks for helping!
@droftarts
after i set the sensor to PT1000, comes a problem while tuning
Warning: heater behaviour was not consistent during tuning
Auto tuning heater 1 completed after 3 idle and 25 tuning cycles in 1240 seconds. This heater needs the following M307 command:
M307 H1 R2.888 K4.029:0.000 D8.49 E1.35 S1.00 B0 V24.0
Send M500 to save this command in config-override.g
the Heater doesnt work correctlly, when i set the temperature to 415c, it will heat consistantly until the temperture reach 450c and the heater turn to fault state.
@gloomyandy Thank you for your response. The printhead movement is now fine, but I am facing another issue. My H1 is a printhead with a high-temperature heat cartridge and a PT1000 thermal sensor. However, now I have to redefine this printhead using the commands M308 and M147 every time I restart the machine, and I also need to do tuning again. My configuration does not seem to save my operations. What could be the reason for this?
After updating to the latest firmware version 3.5.1, when I input commands in DWC for the printhead to move in the X or Y direction, the printhead moves diagonally instead. This error seems to be due to using the wrong firmware. My board is a Duet WiFi 2, and I used the firmware labeled "Duet2and3Firmware-3.5.1", which I uploaded and extracted directly in DWC. Where did the error occur?
the config is below
; Configuration file for Duet WiFi / Ethernet running RRF3 on E3D Tool Changer
; executed by the firmware on start-up
; General preferences
M111 S0 ; Debugging off
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P2 ; Set firmware compatibility to look like Marlin
M667 S1 ; Select CoreXY mode
; Network
M550 P"ToolChanger" ; Set machine name
;M587 S"ssid" P"password" ; WiFi Settings
;M552 S1 P"ssid" ; Enable WiFi Networking
M552 S1 ; Enable Networking
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet
; Drive direction
M569 P0 S0 ; Drive 0 X
M569 P1 S0 ; Drive 1 Y
M569 P2 S1 ; Drive 2 Z
M569 P3 S1 ; Drive 3 E0
M569 P4 S1 ; Drive 4 E1
M569 P5 S1 ; Drive 5 E2
M569 P6 S1 ; Drive 6 E3
M569 P7 S0 ; Drive 7 COUPLER
M569 P8 S0 ; Drive 8 UNUSED
M569 P9 S0 ; Drive 9 UNUSED
M584 X0 Y1 Z2 C7 E3:4:5:6 ; Apply custom drive mapping
M208 X-35:328.5 Y-49:243 Z0:300 C-45:360 ; Set axis maxima & minima
M92 X100 Y100 Z800 C91.022 E397:397:397:397 ; Set steps per mm assuming x16 microstepping
M350 E16:16:16:16 I1 ; Configure microstepping with interpolation
M350 C16 I1 ; Configure microstepping without interpolation
M350 X16 Y16 Z16 I1 ; Configure microstepping with interpolation
M566 X400 Y400 Z8 C2 E2:2:2:2 ; Set maximum instantaneous speed changes (mm/min)
M203 X35000 Y35000 Z600 C5000 E5000:5000:5000:5000 ; Set maximum speeds (mm/min)
M201 X6000 Y6000 Z200 C500 E2500:2500:2500:2500 ; Set accelerations (mm/s^2)
M906 X1800 Y1800 Z1330 I30 ; Idle motion motors to 30%
M906 E1000:1000:1000:1000 C500 I10 ; Idle extruder motors to 10%
; Endstops
M574 X1 Y1 S3 ; Set X / Y endstop stall detection
M574 C0 Z0 ; No C Z endstop
; Z probe
M558 P8 C"zstop" H3 F360 I0 T20000 ; Set Z probe type to switch, the axes for which it is used and the dive height + speeds
G31 P200 X0 Y0 Z0 ; Set Z probe trigger value, offset and trigger height
M557 X10:290 Y20:180 S40 ; Define mesh grid
;Stall Detection
M915 X Y S3 F0 H400 R4700 ; X / Y Axes
; Heaters
M308 S0 P"bedtemp" Y"thermistor" A"Bed" T100000 B4138 C0 ; Set thermistor
M950 H0 C"bedheat" T0 ; Bed heater
M143 H0 S225 ; Set temperature limit for heater 0 to 225C
M140 H0 ; Bed heater is heater 0
M308 S1 P"e0temp" Y"thermistor" A"T0" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H1 C"e0heat" T1 ; Extruder 0 heater
M143 H1 S420 ; Set temperature limit for heater 1 to 300C
M308 S2 P"e1temp" Y"thermistor" A"T1" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H2 C"e1heat" T2 ; Extruder 0 heater
M143 H2 S305 ; Set temperature limit for heater 2 to 300C
M308 S3 P"e2temp" Y"thermistor" A"T2" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H3 C"duex.e2heat" T3 ; Extruder 0 heater
M143 H3 S305 ; Set temperature limit for heater 3 to 300C
M308 S4 P"e3temp" Y"pt1000" A"T3" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H4 C"duex.e3heat" T4 ; Extruder 0 heater
M143 H4 S305 ; Set temperature limit for heater 4 to 300C
; Tools
M563 P0 S"T0" D0 H1 F2 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Reset tool 0 axis offsets
G10 P0 R0 S0 ; Reset initial tool 0 active and standby temperatures to 0C
M563 P1 S"T1" D1 H2 F4 ; Define tool 1
G10 P1 X0 Y0 Z0 ; Reset tool 1 axis offsets
G10 P1 R0 S0 ; Reset initial tool 1 active and standby temperatures to 0C
M563 P2 S"T2" D2 H3 F6 ; Define tool 2
G10 P2 X0 Y0 Z0 ; Reset tool 2 axis offsets
G10 P2 R0 S0 ; Reset initial tool 2 active and standby temperatures to 0C
M563 P3 S"T3" D3 H4 F8 ; Define tool 3
G10 P3 X0 Y0 Z0 ; Reset tool 3 axis offsets
G10 P3 R0 S0 ; Reset initial tool 3 active and standby temperatures to 0C
; Fans
M950 F1 C"fan1"
M950 F2 C"fan2"
M950 F3 C"duex.fan3"
M950 F4 C"duex.fan4"
M950 F5 C"duex.fan5"
M950 F6 C"duex.fan6"
M950 F7 C"duex.fan7"
M950 F8 C"duex.fan8"
M106 P1 S255 H1 T70 ; T0 HE
M106 P2 S0 ; T0 PCF
M106 P3 S255 H2 T70 ; T1 HE
M106 P4 S0 ; T1 PCF
M106 P5 S255 H3 T70 ; T2 HE
M106 P6 S0 ; T2 PCF
M106 P7 S255 H4 T70 ; T3 HE
M106 P8 S0 ; T3 PCF
;M593 F42.2 ; cancel ringing at 42.2Hz (https://forum.e3d-online.com/threads/accelerometer-and-resonance-measurements-of-the-motion-system.3445/)
;M376 H15 ; bed compensation taper
;tool offsets
; !ESTIMATED! offsets for:
; V6-tool: X-9 Y39 Z-5
; Volcano-tool: X-9 Y39 Z-13.5
; Hemera-tool: X20 Y43.5 Z-6
G10 P0 X-9 Y39 Z-6.95 ; T0
G10 P1 X-8.8 Y38.9 Z-5.43 ; T1
G10 P2 X-9 Y39 Z-5 ; T2
G10 P3 X-9.5 Y39.5 Z-6.18 ; T3
;M572 D0 S0.2 ; pressure advance T0
;M572 D1 S0.2 ; pressure advance T1
;M572 D2 S0.2 ; pressure advance T2
;M572 D3 S0.2 ; pressure advance T3
M575 P1 S1 B57600 ; Enable LCD
G29 S2 ; disable mesh
T-1 ; deselect tools
M501 ; load config-override.g
I tried following your suggestion, and the results for the first and second layers were very good. However, starting from the third layer, I feel that the step distance for each layer along the Z-axis is too large, likely more than 0.2 mm.
This is strange because the issue suddenly appeared after I adjusted the Z-offset once, and it only occurs with this one printhead, while the others work normally.
I encountered a problem while printing. When printing the same layer, there seems to be different Z offsets.
Ideally, the Z direction should remain constant when the printer is printing the same layer. However, I tried two different infill methods, rectilinear and concentric, and both showed errors. With rectilinear, after printing the upper part and switching to the lower, the print bed moved downwards, preventing the material from adhering to the print bed. With concentric, the print bed also dropped while printing from the inside outwards. All of these issues occurred while printing the same layer.
Does anyone know what the problem might be? I think the reason is that the print bed automatically lowered during printing. Could it be an issue with mesh bed compensation?
The equipment is Duet wifi2 with newest Firmware
; Configuration file for Duet WiFi / Ethernet running RRF3 on E3D Tool Changer
; executed by the firmware on start-up
; General preferences
M111 S0 ; Debugging off
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P2 ; Set firmware compatibility to look like Marlin
M667 S1 ; Select CoreXY mode
; Network
M550 P"ToolChanger" ; Set machine name
;M587 S"ssid" P"password" ; WiFi Settings
;M552 S1 P"ssid" ; Enable WiFi Networking
M552 S1 ; Enable Networking
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet
; Drive direction
M569 P0 S0 ; Drive 0 X
M569 P1 S0 ; Drive 1 Y
M569 P2 S1 ; Drive 2 Z
M569 P3 S1 ; Drive 3 E0
M569 P4 S1 ; Drive 4 E1
M569 P5 S1 ; Drive 5 E2
M569 P6 S1 ; Drive 6 E3
M569 P7 S0 ; Drive 7 COUPLER
M569 P8 S0 ; Drive 8 UNUSED
M569 P9 S0 ; Drive 9 UNUSED
M584 X0 Y1 Z2 C7 E3:4:5:6 ; Apply custom drive mapping
M208 X-35:328.5 Y-49:243 Z0:300 C-45:360 ; Set axis maxima & minima
M92 X100 Y100 Z800 C91.022 E397:397:397:397 ; Set steps per mm assuming x16 microstepping
M350 E16:16:16:16 I1 ; Configure microstepping with interpolation
M350 C16 I10 ; Configure microstepping without interpolation
M350 X16 Y16 Z16 I1 ; Configure microstepping with interpolation
M566 X400 Y400 Z8 C2 E2:2:2:2 ; Set maximum instantaneous speed changes (mm/min)
M203 X35000 Y35000 Z1200 C5000 E5000:5000:5000:5000 ; Set maximum speeds (mm/min)
M201 X6000 Y6000 Z400 C500 E2500:2500:2500:2500 ; Set accelerations (mm/s^2)
M906 X1800 Y1800 Z1330 I30 ; Idle motion motors to 30%
M906 E1000:1000:1000:1000 C500 I10 ; Idle extruder motors to 10%
; Endstops
M574 X1 Y1 S3 ; Set X / Y endstop stall detection
M574 C0 Z0 ; No C Z endstop
; Z probe
M558 P8 C"zstop" H3 F360 I0 T20000 ; Set Z probe type to switch, the axes for which it is used and the dive height + speeds
G31 P200 X0 Y0 Z0 ; Set Z probe trigger value, offset and trigger height
M557 X10:290 Y20:180 S40 ; Define mesh grid
;Stall Detection
M915 X Y S3 F0 H400 R4700 ; X / Y Axes
; Heaters
M308 S0 P"bedtemp" Y"thermistor" A"Bed" T100000 B4138 C0 ; Set thermistor
M950 H0 C"bedheat" T0 ; Bed heater
M143 H0 S225 ; Set temperature limit for heater 0 to 225C
M140 H0 ; Bed heater is heater 0
M308 S1 P"e0temp" Y"thermistor" A"T0" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H1 C"e0heat" T1 ; Extruder 0 heater
M143 H1 S305 ; Set temperature limit for heater 1 to 300C
M308 S2 P"e1temp" Y"thermistor" A"T1" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H2 C"e1heat" T2 ; Extruder 0 heater
M143 H2 S305 ; Set temperature limit for heater 2 to 300C
M308 S3 P"e2temp" Y"thermistor" A"T2" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H3 C"duex.e2heat" T3 ; Extruder 0 heater
M143 H3 S305 ; Set temperature limit for heater 3 to 300C
M308 S4 P"e3temp" Y"pt1000" A"T3" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H4 C"duex.e3heat" T4 ; Extruder 0 heater
M143 H4 S420 ; Set temperature limit for heater 4 to 300C
; Tools
M563 P0 S"T0" D0 H1 F2 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Reset tool 0 axis offsets
G10 P0 R0 S0 ; Reset initial tool 0 active and standby temperatures to 0C
M563 P1 S"T1" D1 H2 F4 ; Define tool 1
G10 P1 X0 Y0 Z0 ; Reset tool 1 axis offsets
G10 P1 R0 S0 ; Reset initial tool 1 active and standby temperatures to 0C
M563 P2 S"T2" D2 H3 F6 ; Define tool 2
G10 P2 X0 Y0 Z0 ; Reset tool 2 axis offsets
G10 P2 R0 S0 ; Reset initial tool 2 active and standby temperatures to 0C
M563 P3 S"T3" D3 H4 F8 ; Define tool 3
G10 P3 X0 Y0 Z0 ; Reset tool 3 axis offsets
G10 P3 R0 S0 ; Reset initial tool 3 active and standby temperatures to 0C
; Fans
M950 F1 C"fan1"
M950 F2 C"fan2"
M950 F3 C"duex.fan3"
M950 F4 C"duex.fan4"
M950 F5 C"duex.fan5"
M950 F6 C"duex.fan6"
M950 F7 C"duex.fan7"
M950 F8 C"duex.fan8"
M106 P1 S255 H1 T70 ; T0 HE
M106 P2 S0 ; T0 PCF
M106 P3 S255 H2 T70 ; T1 HE
M106 P4 S0 ; T1 PCF
M106 P5 S255 H3 T70 ; T2 HE
M106 P6 S0 ; T2 PCF
M106 P7 S255 H4 T70 ; T3 HE
M106 P8 S0 ; T3 PCF
;M593 F42.2 ; cancel ringing at 42.2Hz (https://forum.e3d-online.com/threads/accelerometer-and-resonance-measurements-of-the-motion-system.3445/)
;M376 H15 ; bed compensation taper
;tool offsets
; !ESTIMATED! offsets for:
; V6-tool: X-9 Y39 Z-5
; Volcano-tool: X-9 Y39 Z-13.5
; Hemera-tool: X20 Y43.5 Z-6
G10 P0 X-9 Y39 Z-6.18 ; T0
G10 P1 X-8.8 Y38.9 Z-5.43 ; T1
G10 P2 X-9 Y39 Z-5 ; T2
G10 P3 X-9.5 Y39.5 Z-6.95 ; T3
;M572 D0 S0.2 ; pressure advance T0
;M572 D1 S0.2 ; pressure advance T1
;M572 D2 S0.2 ; pressure advance T2
;M572 D3 S0.2 ; pressure advance T3
M575 P1 S1 B57600 ; Enable LCD
G29 S2 ; disable mesh
T-1 ; deselect tools
M501 ; load config-override.g
@droftarts
Hello！
After tightening the motor and pulleys, the previously mentioned layer shift issue was resolved. However, layer shifting still occurs when changing the printhead, as shown in the picture. The black material should align perfectly with the material below it. It seems that the direction of this layer shift is also diagonal. Do you know what might be causing this?
Hello everyone,
I'm reaching out for some assistance as I've encountered a persistent problem with my 3D printer. Regardless of which print head I use, my printed parts are experiencing layer shifts. Specifically, the Z-axis appears to be tilting, with the direction of the tilt being towards the top-left of the print bed.
This issue persists no matter which print head I use, leading me to wonder where the problem might lie. Could it possibly be an issue with the slicer software I'm using? I'm at a bit of a loss here and would greatly appreciate any insights or suggestions you might have.
the board I'm using is Duet 2 wifi
Thank you in advance for your help!
Great! That is the reason, thanks for your help 
Hello everyone,
I replaced the PT1000 temperature sensor for my higher power heat cartridges, but after connecting it, the sensor incorrectly reads the temperature as 158 degrees at room temperature.
my hardware is DUET2WIFI with the newest firmware.
here is my config:
; Configuration file for Duet WiFi / Ethernet running RRF3 on E3D Tool Changer
; executed by the firmware on start-up
; General preferences
M111 S0 ; Debugging off
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P2 ; Set firmware compatibility to look like Marlin
M667 S1 ; Select CoreXY mode
; Network
M550 P"ToolChanger" ; Set machine name
;M587 S"ssid" P"password" ; WiFi Settings
;M552 S1 P"ssid" ; Enable WiFi Networking
M552 S1 ; Enable Networking
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet
; Drive direction
M569 P0 S0 ; Drive 0 X
M569 P1 S0 ; Drive 1 Y
M569 P2 S1 ; Drive 2 Z
M569 P3 S1 ; Drive 3 E0
M569 P4 S1 ; Drive 4 E1
M569 P5 S1 ; Drive 5 E2
M569 P6 S1 ; Drive 6 E3
M569 P7 S0 ; Drive 7 COUPLER
M569 P8 S0 ; Drive 8 UNUSED
M569 P9 S0 ; Drive 9 UNUSED
M584 X0 Y1 Z2 C7 E3:4:5:6 ; Apply custom drive mapping
M208 X-35:328.5 Y-49:243 Z0:300 C-45:360 ; Set axis maxima & minima
M92 X100 Y100 Z800 C91.022 E397:397:397:397 ; Set steps per mm assuming x16 microstepping
M350 E16:16:16:16 I1 ; Configure microstepping with interpolation
M350 C16 I10 ; Configure microstepping without interpolation
M350 X16 Y16 Z16 I1 ; Configure microstepping with interpolation
M566 X400 Y400 Z8 C2 E2:2:2:2 ; Set maximum instantaneous speed changes (mm/min)
M203 X35000 Y35000 Z1200 C5000 E5000:5000:5000:5000 ; Set maximum speeds (mm/min)
M201 X6000 Y6000 Z400 C500 E2500:2500:2500:2500 ; Set accelerations (mm/s^2)
M906 X1800 Y1800 Z1330 I30 ; Idle motion motors to 30%
M906 E1000:1000:1000:1000 C500 I10 ; Idle extruder motors to 10%
; Endstops
M574 X1 Y1 S3 ; Set X / Y endstop stall detection
M574 C0 Z0 ; No C Z endstop
; Z probe
M558 P8 C"zstop" H3 F360 I0 T20000 ; Set Z probe type to switch, the axes for which it is used and the dive height + speeds
G31 P200 X0 Y0 Z0 ; Set Z probe trigger value, offset and trigger height
M557 X10:290 Y20:180 S40 ; Define mesh grid
;Stall Detection
M915 X Y S3 F0 H400 R4700 ; X / Y Axes
; Heaters
M308 S0 P"bedtemp" Y"thermistor" A"Bed" T100000 B4138 C0 ; Set thermistor
M950 H0 C"bedheat" T0 ; Bed heater
M143 H0 S225 ; Set temperature limit for heater 0 to 225C
M140 H0 ; Bed heater is heater 0
M308 S1 P"e0temp" Y"thermistor" A"T0" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H1 C"e0heat" T1 ; Extruder 0 heater
M143 H1 S305 ; Set temperature limit for heater 1 to 300C
M308 S2 P"e1temp" Y"thermistor" A"T1" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H2 C"e1heat" T2 ; Extruder 0 heater
M143 H2 S305 ; Set temperature limit for heater 2 to 300C
M308 S3 P"e2temp" Y"thermistor" A"T2" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H3 C"duex.e2heat" T3 ; Extruder 0 heater
M143 H3 S305 ; Set temperature limit for heater 3 to 300C
M308 S4 P"e3temp" Y"thermistor" A"T3" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H4 C"duex.e3heat" T4 ; Extruder 0 heater
M143 H4 S305 ; Set temperature limit for heater 4 to 300C
; Tools
M563 P0 S"T0" D0 H1 F2 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Reset tool 0 axis offsets
G10 P0 R0 S0 ; Reset initial tool 0 active and standby temperatures to 0C
M563 P1 S"T1" D1 H2 F4 ; Define tool 1
G10 P1 X0 Y0 Z0 ; Reset tool 1 axis offsets
G10 P1 R0 S0 ; Reset initial tool 1 active and standby temperatures to 0C
M563 P2 S"T2" D2 H3 F6 ; Define tool 2
G10 P2 X0 Y0 Z0 ; Reset tool 2 axis offsets
G10 P2 R0 S0 ; Reset initial tool 2 active and standby temperatures to 0C
M563 P3 S"T3" D3 H4 F8 ; Define tool 3
G10 P3 X0 Y0 Z0 ; Reset tool 3 axis offsets
G10 P3 R0 S0 ; Reset initial tool 3 active and standby temperatures to 0C
; Fans
M950 F1 C"fan1"
M950 F2 C"fan2"
M950 F3 C"duex.fan3"
M950 F4 C"duex.fan4"
M950 F5 C"duex.fan5"
M950 F6 C"duex.fan6"
M950 F7 C"duex.fan7"
M950 F8 C"duex.fan8"
M106 P1 S255 H1 T70 ; T0 HE
M106 P2 S0 ; T0 PCF
M106 P3 S255 H2 T70 ; T1 HE
M106 P4 S0 ; T1 PCF
M106 P5 S255 H3 T70 ; T2 HE
M106 P6 S0 ; T2 PCF
M106 P7 S255 H4 T70 ; T3 HE
M106 P8 S0 ; T3 PCF
;M593 F42.2 ; cancel ringing at 42.2Hz (https://forum.e3d-online.com/threads/accelerometer-and-resonance-measurements-of-the-motion-system.3445/)
;M376 H15 ; bed compensation taper
;tool offsets
; !ESTIMATED! offsets for:
; V6-tool: X-9 Y39 Z-5
; Volcano-tool: X-9 Y39 Z-13.5
; Hemera-tool: X20 Y43.5 Z-6
G10 P0 X-9 Y39 Z-6.25 ; T0
G10 P1 X-9 Y39 Z-5 ; T1
G10 P2 X-9 Y39 Z-5 ; T2
G10 P3 X-9 Y39 Z-5 ; T3
;M572 D0 S0.2 ; pressure advance T0
;M572 D1 S0.2 ; pressure advance T1
;M572 D2 S0.2 ; pressure advance T2
;M572 D3 S0.2 ; pressure advance T3
M575 P1 S1 B57600 ; Enable LCD
G29 S2 ; disable mesh
T-1 ; deselect tools
M501 ; load config-override.g
and the anwser of command 308:
M308 S4
Sensor 4 (T3) type Thermistor using pin (e3temp,duex.e3temp,exp.thermistor4,exp.36), reading 158.5, last error: sensor open circuit, T:100000.0 B:4725.0 C:7.06e-8 R:2200.0 L:0 H:0
If anyone has any ideas or solutions, please let me know. Thank you very much :):):)
@droftarts
Hello mr administrator,
If it's an issue of insufficient voltage, can I adjust the voltage of the heater on DWC? Or do I need to replace it with a higher power supply module?
@droftarts I attempted to tune heater1 and heater4, the Command is M303 T0(T3) S200, and the result was the same, both heaters can only reach a maximum of around 150 degrees, and the heating will stop and in Console shows tune canceled.
the temperature is as follows
@droftarts Hello Mr administrator,
I tried to tune my heater, but it was always unsuccessful. The error displayed is: Auto tune cancelled because target temperature was not reached.
My config:
; Configuration file for Duet WiFi / Ethernet running RRF3 on E3D Tool Changer
; executed by the firmware on start-up
; General preferences
M111 S0 ; Debugging off
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P2 ; Set firmware compatibility to look like Marlin
M667 S1 ; Select CoreXY mode
; Network
M550 P"ToolChanger" ; Set machine name
;M587 S"ssid" P"password" ; WiFi Settings
;M552 S1 P"ssid" ; Enable WiFi Networking
M552 S1 ; Enable Networking
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet
; Drive direction
M569 P0 S0 ; Drive 0 X
M569 P1 S0 ; Drive 1 Y
M569 P2 S1 ; Drive 2 Z
M569 P3 S0 ; Drive 3 E0
M569 P4 S0 ; Drive 4 E1
M569 P5 S1 ; Drive 5 E2
M569 P6 S1 ; Drive 6 E3
M569 P7 S0 ; Drive 7 COUPLER
M569 P8 S0 ; Drive 8 UNUSED
M569 P9 S0 ; Drive 9 UNUSED
M584 X0 Y1 Z2 C7 E3:4:5:6 ; Apply custom drive mapping
M208 X-35:328.5 Y-49:243 Z0:300 C-45:360 ; Set axis maxima & minima
M92 X100 Y100 Z1600 C91.022 E834:834:834:834 ; Set steps per mm assuming x16 microstepping
M350 E16:16:16:16 I1 ; Configure microstepping with interpolation
M350 C16 I10 ; Configure microstepping without interpolation
M350 X16 Y16 Z16 I1 ; Configure microstepping with interpolation
M566 X400 Y400 Z8 C2 E2:2:2:2 ; Set maximum instantaneous speed changes (mm/min)
M203 X35000 Y35000 Z1200 C5000 E5000:5000:5000:5000 ; Set maximum speeds (mm/min)
M201 X6000 Y6000 Z400 C500 E2500:2500:2500:2500 ; Set accelerations (mm/s^2)
M906 X1800 Y1800 Z1330 I30 ; Idle motion motors to 30%
M906 E1000:1000:1000:1000 C500 I10 ; Idle extruder motors to 10%
; Endstops
M574 X1 Y1 S3 ; Set X / Y endstop stall detection
M574 C0 Z0 ; No C Z endstop
; Z probe
M558 P8 C"zstop" H3 F360 I0 T20000 ; Set Z probe type to switch, the axes for which it is used and the dive height + speeds
G31 P200 X0 Y0 Z0 ; Set Z probe trigger value, offset and trigger height
M557 X10:290 Y20:180 S40 ; Define mesh grid
;Stall Detection
M915 X Y S3 F0 H400 R4700 ; X / Y Axes
; Heaters
M308 S0 P"bedtemp" Y"thermistor" A"Bed" T100000 B4138 C0 ; Set thermistor
M950 H0 C"bedheat" T0 ; Bed heater
M143 H0 S225 ; Set temperature limit for heater 0 to 225C
M140 H0 ; Bed heater is heater 0
M308 S1 P"e0temp" Y"thermistor" A"T0" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H1 C"e0heat" T1 ; Extruder 0 heater
M143 H1 S305 ; Set temperature limit for heater 1 to 300C
M308 S2 P"e1temp" Y"thermistor" A"T1" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H2 C"e1heat" T2 ; Extruder 0 heater
M143 H2 S305 ; Set temperature limit for heater 2 to 300C
M308 S3 P"e2temp" Y"thermistor" A"T2" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H3 C"duex.e2heat" T3 ; Extruder 0 heater
M143 H3 S305 ; Set temperature limit for heater 3 to 300C
M308 S4 P"e3temp" Y"thermistor" A"T3" T100000 B4725 C7.06e-8 ; Set thermistor
M950 H4 C"duex.e3heat" T4 ; Extruder 0 heater
M143 H4 S305 ; Set temperature limit for heater 4 to 300C
; Tools
M563 P0 S"T0" D0 H1 F2 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Reset tool 0 axis offsets
G10 P0 R0 S0 ; Reset initial tool 0 active and standby temperatures to 0C
M563 P1 S"T1" D1 H2 F4 ; Define tool 1
G10 P1 X0 Y0 Z0 ; Reset tool 1 axis offsets
G10 P1 R0 S0 ; Reset initial tool 1 active and standby temperatures to 0C
M563 P2 S"T2" D2 H3 F6 ; Define tool 2
G10 P2 X0 Y0 Z0 ; Reset tool 2 axis offsets
G10 P2 R0 S0 ; Reset initial tool 2 active and standby temperatures to 0C
M563 P3 S"T3" D3 H4 F8 ; Define tool 3
G10 P3 X0 Y0 Z0 ; Reset tool 3 axis offsets
G10 P3 R0 S0 ; Reset initial tool 3 active and standby temperatures to 0C
; Fans
M950 F1 C"fan1"
M950 F2 C"fan2"
M950 F3 C"duex.fan3"
M950 F4 C"duex.fan4"
M950 F5 C"duex.fan5"
M950 F6 C"duex.fan6"
M950 F7 C"duex.fan7"
M950 F8 C"duex.fan8"
M106 P1 S255 H1 T70 ; T0 HE
M106 P2 S0 ; T0 PCF
M106 P3 S255 H2 T70 ; T1 HE
M106 P4 S0 ; T1 PCF
M106 P5 S255 H3 T70 ; T2 HE
M106 P6 S0 ; T2 PCF
M106 P7 S255 H4 T70 ; T3 HE
M106 P8 S0 ; T3 PCF
M593 F42.2 ; cancel ringing at 42.2Hz (https://forum.e3d-online.com/threads/accelerometer-and-resonance-measurements-of-the-motion-system.3445/)
;M376 H15 ; bed compensation taper
;tool offsets
; !ESTIMATED! offsets for:
; V6-tool: X-9 Y39 Z-5
; Volcano-tool: X-9 Y39 Z-13.5
; Hemera-tool: X20 Y43.5 Z-6
G10 P0 X-9 Y39 Z-5 ; T0
G10 P1 X-9 Y39 Z-5 ; T1
G10 P2 X-9 Y39 Z-5 ; T2
G10 P3 X-9 Y39 Z-5 ; T3
;M572 D0 S0.2 ; pressure advance T0
;M572 D1 S0.2 ; pressure advance T1
;M572 D2 S0.2 ; pressure advance T2
;M572 D3 S0.2 ; pressure advance T3
M575 P1 S1 B57600 ; Enable LCD
G29 S2 ; disable mesh
T-1 ; deselect tools
M501 ; load config-override.g
and the PID parameter:
M307 H4
Heater 4: heating rate 2.430, cooling rate 0.560, dead time 30.00, max PWM 1.00, mode PID, calibrated at 0.0V
Predicted max temperature rise 296°C
PID parameters: heating P2.4 I0.032 D51.4, steady P2.4 I0.045 D51.4
Heater 4: heating rate 2.430, cooling rate 0.560, dead time 30.00, max PWM 1.00, mode PID, calibrated at 0.0V
Predicted max temperature rise 296°C
PID parameters: heating P2.4 I0.032 D51.4, steady P2.4 I0.045 D51.4
Hello Mr Administrator,
I upload the newest RRF version, but I still can't head the printhead:(
temperature rising too slowly: expected 2.32°C/sec measured 0.63°C/sec
M122
=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 3.4.6 (2023-07-21 14:08:28) running on Duet WiFi 1.02 or later + DueX5v0.11
Board ID: 0JD0M-9X6JA-JUNSN-6JTD2-3SD6T-KBRRV
Used output buffers: 1 of 26 (19 max)
=== RTOS ===
Static ram: 23896
Dynamic ram: 78284 of which 0 recycled
Never used RAM 9564, free system stack 118 words
Tasks: NETWORK(notifyWait,15.5%,242) HEAT(notifyWait,0.0%,295) Move(notifyWait,0.0%,282) DUEX(notifyWait,0.0%,24) MAIN(running,84.3%,436) IDLE(ready,0.2%,30), total 100.0%
Owned mutexes: WiFi(NETWORK)
=== Platform ===
Last reset 00:10:47 ago, cause: power up
Last software reset at 2024-01-16 15:56, reason: User, GCodes spinning, available RAM 9264, slot 1
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0041f000 BFAR 0xe000ed38 SP 0x00000000 Task MAIN Freestk 0 n/a
Error status: 0x00
Aux0 errors 0,0,0
Step timer max interval 0
MCU temperature: min 33.8, current 38.5, max 39.7
Supply voltage: min 11.8, current 12.0, max 12.3, under voltage events: 0, over voltage events: 0, power good: yes
Heap OK, handles allocated/used 0/0, heap memory allocated/used/recyclable 0/0/0, gc cycles 0
Events: 1 queued, 1 completed
Driver 0: standstill, SG min 0
Driver 1: standstill, SG min 0
Driver 2: standstill, SG min 0
Driver 3: standstill, SG min n/a
Driver 4: standstill, SG min n/a
Driver 5: standstill, SG min n/a
Driver 6: standstill, SG min n/a
Driver 7: standstill, SG min 0
Driver 8: standstill, SG min n/a
Driver 9: standstill, SG min n/a
Driver 10:
Driver 11:
Date/time: 2024-01-16 16:11:41
Cache data hit count 4294967295
Slowest loop: 19.66ms; fastest: 0.19ms
I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
=== Storage ===
Free file entries: 10
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest read time 8.9ms, write time 2.1ms, max retries 0
=== Move ===
DMs created 83, segments created 14, maxWait 56617ms, bed compensation in use: none, comp offset 0.000
=== MainDDARing ===
Scheduled moves 145, completed 145, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 93], CDDA state -1
=== AuxDDARing ===
Scheduled moves 0, completed 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== Heat ===
Bed heaters 0 -1 -1 -1, chamber heaters -1 -1 -1 -1, ordering errs 0
=== GCodes ===
Segments left: 0
Movement lock held by null
HTTP is idle in state(s) 0
Telnet is idle in state(s) 0
File is idle in state(s) 0
USB is idle in state(s) 0
Aux is idle in state(s) 0
Trigger is idle in state(s) 0
Queue is idle in state(s) 0
LCD is idle in state(s) 0
Daemon is idle in state(s) 0
Autopause is idle in state(s) 0
Code queue is empty
=== DueX ===
Read count 1, 0.09 reads/min
=== Network ===
Slowest loop: 22.38ms; fastest: 0.00ms
Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0)
HTTP sessions: 1 of 8
= WiFi =
Interface state: active
Module is connected to access point
Failed messages: pending 0, notready 0, noresp 0
WiFi firmware version 1.27
WiFi MAC address 48:3f:da:a6:84:05
WiFi Vcc 3.40, reset reason Power up
WiFi flash size 2097152, free heap 25136
WiFi IP address 10.10.0.163
WiFi signal strength -49dBm, mode 802.11n, reconnections 0, sleep mode modem
Clock register 00002002
Socket states: 0 0 0 0 0 0 0 0
@jay_s_uk @droftarts
Great it works!
and a followed question: When I attempt to heat the nozzle, it shows that the M568 command is no longer needed. I referred to other posts on forums, and they suggest the issue might be a mismatch but I believe I have installed the latest firmware version for the Duet 2 WiFi/Ethernet. Could there be another reason for this issue? or anywhere wrong?
M122
=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 3.2.2 running on Duet WiFi 1.02 or later + DueX5
Board ID: 0JD0M-9X6JA-JUNSN-6JTD2-3SD6T-KBRRV
Used output buffers: 3 of 24 (24 max)
=== RTOS ===
Static ram: 23460
Dynamic ram: 76280 of which 60 recycled
Never used RAM 12280, free system stack 115 words
Tasks: NETWORK(ready,169) HEAT(blocked,308) DUEX(blocked,31) MAIN(running,449) IDLE(ready,20)
Owned mutexes: WiFi(NETWORK)
=== Platform ===
Last reset 00:07:44 ago, cause: power up
Last software reset at 2024-01-16 13:48, reason: User, GCodes spinning, available RAM 12280, slot 0
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0041f000 BFAR 0xe000ed38 SP 0x00000000 Task MAIN Freestk 0 n/a
Error status: 0x00
Aux0 errors 0,0,0
MCU temperature: min 29.7, current 37.5, max 37.5
Supply voltage: min 11.9, current 12.0, max 12.3, under voltage events: 0, over voltage events: 0, power good: yes
Driver 0: position 13750, standstill, SG min/max 0/1023
Driver 1: position -16250, standstill, SG min/max 0/1023
Driver 2: position 12800, standstill, SG min/max 0/1023
Driver 3: position 3641, standstill, SG min/max not available
Driver 4: position 0, standstill, SG min/max not available
Driver 5: position 0, standstill, SG min/max not available
Driver 6: position 0, standstill, SG min/max not available
Driver 7: position 0, standstill, SG min/max 0/79
Driver 8: position 0, standstill, SG min/max not available
Driver 9: position 0, standstill, SG min/max not available
Driver 10: position 0
Driver 11: position 0
Date/time: 2024-01-16 14:37:37
Cache data hit count 566541634
Slowest loop: 9.99ms; fastest: 0.18ms
I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
=== Storage ===
Free file entries: 10
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest read time 4.0ms, write time 0.0ms, max retries 0
=== Move ===
DMs created 83, maxWait 179513ms, bed compensation in use: none, comp offset 0.000
=== MainDDARing ===
Scheduled moves 26, completed moves 26, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== AuxDDARing ===
Scheduled moves 0, completed moves 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1 -1 -1
Heater 1 is on, I-accum = 0.0
=== GCodes ===
Segments left: 0
Movement lock held by null
HTTP is idle in state(s) 0
Telnet is idle in state(s) 0
File is idle in state(s) 0
USB is idle in state(s) 0
Aux is idle in state(s) 0
Trigger is idle in state(s) 0
Queue is idle in state(s) 0
LCD is idle in state(s) 0
Daemon is idle in state(s) 0
Autopause is idle in state(s) 0
Code queue is empty.
=== Network ===
Slowest loop: 24.56ms; fastest: 0.00ms
Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0), 0 sessions
HTTP sessions: 1 of 8
- WiFi -
Network state is active
WiFi module is connected to access point
Failed messages: pending 0, notready 0, noresp 0
WiFi firmware version 1.26
WiFi MAC address 48:3f:da:a6:84:05
WiFi Vcc 3.40, reset reason Power up
WiFi flash size 2097152, free heap 24400
WiFi IP address 10.10.0.163
WiFi signal strength -71dBm, mode 802.11n, reconnections 0, sleep mode modem
Clock register 00002002
Socket states: 0 2 0 0 0 0 0 0
=== DueX ===
Read count 1, 0.13 reads/min
@droftarts @jay_s_uk
Hello jay and mr administrator,
After implementing your suggestions, part of the home Z function succeeded. However, I need to manually move the printhead above the Print bed position before I run home Z. When I use the home Z command directly after homeX and Y, although the dashboard shows the Printhead's position as 150 and 100, it is actually still in the bottom left corner. In this position, the print bed cannot reach the probe Z sensor.
now im using RRF3
the home Z code:
; homez.g
; called to home the Z axis
M98 P"/macros/Coupler - Unlock" ; Open Coupler
G91 ; Relative mode
G1 H2 Z5 F5000 ; Lower the bed
G90 ; back to absolute positioning
G1 X150 Y100 F50000 ; Position the endstop above the bed centre
M558 F1000
G30
M558 F300
G30
@jay_s_uk hi jay here's the config
; Configurat; Configuration file for Duet WiFi / Ethernet
; executed by the firmware on start-up
; General preferences
M111 S0 ; Debugging off
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P2 ; Set firmware compatibility to look like Marlin
; Network
; Read https://duet3d.dozuki.com/Wiki/Gcode#Section_M587_Add_WiFi_host_network_to_remembered_list_or_list_remembered_networks
M550 P"ToolChanger" ; Set machine name
M552 S1 ; Enable Networking
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet
M667 S1 ; Select CoreXY mode
; Endstops
M574 X1 Y1 S3 ; Set X / Y endstop stall detection
M574 Z1 S2 ; Set Z endstop probe
M558 P7 X0 Y0 Z2 H3 F360 I0 T20000 ; Set Z probe type to switch, the axes for which it is used and the dive height + speeds
G31 P200 X0 Y0 Z0 ; Set Z probe trigger value, offset and trigger height
M557 X10:290 Y20:180 S40 ; Define mesh grid
; Drive direction
M569 P0 S0 ; Drive 0 X
M569 P1 S0 ; Drive 1 Y
M569 P2 S1 ; Drive 2 Z
M569 P3 S0 ; Drive 3 E0
M569 P4 S0 ; Drive 4 E1
M569 P5 S1 ; Drive 5 E2
M569 P6 S1 ; Drive 6 E3
M569 P7 S0 ; Drive 7 COUPLER
M569 P8 S0 ; Drive 8 UNUSED
M569 P9 S0 ; Drive 9 UNUSED
M584 X0 Y1 Z2 C7 E3:4:5:6 ; Apply custom drive mapping
M208 X-35:328.5 Y-49:243 Z0:300 C0:260 S0 ; Set axis maxima & minima
M350 C8 I0 ; Configure microstepping without interpolation
M350 X16 Y16 Z16 E16:16:16:16 I1 ; Configure microstepping with interpolation
M92 X100 Y100 Z1600 C100 E834:834:834:834 ; Set steps per mm
M566 X400 Y400 Z8 C2 E2:2:2:2 ; Set maximum instantaneous speed changes (mm/min)
M203 X35000 Y35000 Z1200 C5000 E5000:5000:5000:5000 ; Set maximum speeds (mm/min)
M201 X6000 Y6000 Z400 C400 E2500:2500:2500:2500 ; Set accelerations (mm/s^2)
M906 X1800 Y1800 Z1330 C400 I30 ; Idle motion motors to 30%
M906 E1000:1000:1000:1000 I10 ; Idle extruder motors to 10%
;Stall Detection
M915 C S5 F0 H200 ; Coupler
;Stall Detection
M915 X Y S5 F0 H400 ; X / Y Axes
; Heaters
M305 P0 T100000 B4725 C7.06e-8 ; Set thermistor
M143 H0 S225 ; Set temperature limit for heater 0 to 225C
M305 S"T0" P1 T100000 B4725 C7.06e-8 ; Set thermistor
M143 H1 S300 ; Set temperature limit for heater 1 to 300C
M305 S"T1" P2 T100000 B4725 C7.06e-8 ; Set thermistor
M143 H2 S300 ; Set temperature limit for heater 2 to 300C
M305 S"T2" P3 T100000 B4725 C7.06e-8 ;Set thermistor
M143 H3 S300 ; Set temperature limit for heater 3 to 300C
M305 S"T3" P4 T100000 B4725 C7.06e-8 ; Set thermistor
M143 H4 S300 ; Set temperature limit for heater 4 to 300C
; Tools
M563 P0 S"T0" D0 H1 F2 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Reset tool 0 axis offsets
G10 P0 R0 S0 ; Reset initial tool 0 active and standby temperatures to 0C
M563 P1 S"T1" D1 H2 F4 ; Define tool 1
G10 P1 X0 Y0 Z0 ; Reset tool 1 axis offsets
G10 P1 R0 S0 ; Reset initial tool 1 active and standby temperatures to 0C
M563 P2 S"T2" D2 H3 F6 ; Define tool 2
G10 P2 X0 Y0 Z0 ; Reset tool 2 axis offsets
G10 P2 R0 S0 ; Reset initial tool 2 active and standby temperatures to 0C
M563 P3 S"T3" D3 H4 F8 ; Define tool 3
G10 P3 X0 Y0 Z0 ; Reset tool 3 axis offsets
G10 P3 R0 S0 ; Reset initial tool 3 active and standby temperatures to 0C
; Fans
M106 P0 S0 ; UNUSED
M106 P1 S255 H1 T70 ; T0 HE
M106 P2 S0 ; T0 PCF
M106 P3 S255 H2 T70 ; T1 HE
M106 P4 S0 ; T1 PCF
M106 P5 S255 H3 T70 ; T2 HE
M106 P6 S0 ; T2 PCF
M106 P7 S255 H4 T70 ; T3 HE
M106 P8 S0 ; T3 PCF
M593 F50 ; cancel ringing at 50Hz (https://forum.e3d-online.com/threads/accelerometer-and-resonance-measurements-of-the-motion-system.3445/)
;M376 H15 ; bed compensation taper
;tool offsets
; !ESTIMATED! offsets for:
; V6-tool: X-9 Y39 Z-5
; Volcano-tool: X-9 Y39 Z-13.5
; Hemera-tool: X20 Y43.5 Z-6
G10 P0 X-9 Y39 Z-5 ; T0
G10 P1 X-9 Y39 Z-5 ; T1
G10 P2 X-9 Y39 Z-5 ; T2
G10 P3 X-9 Y39 Z-5 ; T3
;deselect tools
T-1
;M572 D0 S0.2 ; pressure advance T0
;M572 D1 S0.2 ; pressure advance T1
;M572 D2 S0.2 ; pressure advance T2
;M572 D3 S0.2 ; pressure advance T3
M501; load config-override.g
@jay_s_uk
hi jay its the output after using M119
M119
Endstops - X: not stopped, Y: not stopped, Z: at min stop, 
no endstop, Z probe: at min stop
and yes its toolchanger, there is a sensor at the bottom of printhead
Hello everyone,
I'm a complete beginner with Duet 3D, and I'm using the Duet2 WiFi version. After assembling everything, it all seemed to work well. However, I'm encountering an issue when homing the Z-axis. The print bed of the 3D printer moves down three times and then stops at a new position. If I run the home Z command multiple times, the print bed continues to lower until it starts making a noise, yet there are no error messages throughout this process.
I really need help with this issue, so any advice or guidance would be greatly appreciated. If more information is needed to help diagnose the problem, please let me know and I'll provide it as soon as possible. Thank you all in advance!
The home Z code:
; homez.g
; called to home the Z axis
T-1 ;just in case there is a tool coupled, go try to drop it at the dock
M98 P/macros/Coupler - Unlock ;Open Coupler
G91 ; Relative mode
G1 H2 Z5 F5000 ; Lower the bed
G90 ; back to absolute positioning
G1 X150 Y100 F50000 ; Position the endstop above the bed centre
G4 P500
G91 ; Relative mode
G4 P500 ; wait 500msec
G1 Z-300 H1 F1000 ; Move Z down until the switch triggers (first pass)
G4 P500 ; wait 500msec
G1 Z5 F5000 ; Lift Z
G4 P500 ; wait 500msec
G1 Z-300 H1 F300 ; Move Z down until the switch triggers (second pass)
G4 P500 ; wait 500msec
G1 Z5 F5000 ; Drop the Bed
G90 ; Back to absolute positioning