Nozzle will not start low enough to print

damaged_goods

Hi all

Below is my present config file. After I zero my nozzle and attempt to print, the nozzle will not go low enough to give me a good first layer. It seems to start printing at about 2.2 mm above the bed.
Please help!
I am soooo close

; Configuration file for Duet WiFi (firmware version 2.03)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Thu May 07 2020 15:49:06 GMT-0400 (Eastern Daylight Time)

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"My Printer" ; set printer name

; Network
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet

; Drives
M569 P2 S0 ; physical drive 2 goes backwards
M569 P1 S0 ; physical drive 1 goes backwards
M569 P0 S1 ; physical drive 0 goes forwards
M569 P4 S1 ; physical drive 4 goes forwards
M569 P3 S1 ; physical drive 3 goes forwards
M584 X2 Y1 Z0:4 E3 ; set drive mapping
M350 X16 Y16 Z16:16 E16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z1800.00 E420.00 ; set steps per mm
M566 X900.00 Y900.00 Z0.2 E120.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z120.00 E1200.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00 ; set accelerations (mm/s^2)
M906 X1200 Y1400 Z2400 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X1160 Y1430 Z1815 S0 ; set axis maxima

; Endstops
M574 X1 S3 ; set endstops controlled by motor stall detection
M574 Y1 S3 ; set endstops controlled by motor stall detection
M574 Z0 P"nil" ; set endstops controlled by probe

; Z-Probe
M558 P5 C"!zprobe.in" H6 F120 T500 ; set Z probe type to switch and the dive height + speeds
G31 P500 X-30 Y-36 Z0.66 ; set Z probe trigger value, offset and trigger height
M557 X0:1160 Y0:1430 S200 ; define mesh grid

; Heaters
M140 H0 ; enable heated bed; map heated bed to heater 0
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit

M143 H0 S120 ; set temperature limit for heater 0 to 120C
; M305 P1 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 1
M308 S0 P"bed_temp" Y"thermistor" T100000 B3950
M308 S1 P"e0_temp" Y"thermistor" T100000 B4138
; M950 H0 C"bed_heat" T0
M950 H1 C"e0_heat" T1
M143 H1 S280 ; set temperature limit for heater 1 to 280C

; Fans
M950 F0 C"!Fan0"
M106 P0 S0.5 H1 T45 ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 F0 ; define tool 0
G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C

; Custom settings

; X axis sensorless endstop config
M915 X S5 F0 H172 R0

; Y axis sensorless endstop config
M915 Y S8 F0 H172 R0

M501

fcwilt

Hi,

I always check the result of G30 to be sure the Z probe is working as expected.

I have a macro that does something like this

G90      ; absolute mode
G1 X# Y# ; move to center of bed - use X and Y values that account for the Z probe offsets
G30      ; probe bed
G1 Z#    ; move Z to a specific position

At this point I verify that Z is in fact at the correct position. Now in my case my measuring device is a 1mm thickness gauge so the Z move is G1 Z1.

Frederick

damaged_goods

Thank you. I will give that a try.

Phaedrux

What firmware version are you using? M115 to show.

What is the probe?

How are you homing? Post your homeall.g

What do you have in your slicer start gcode?

damaged_goods

@Phaedrux

/31/2020, 7:27:23 PM M115
FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 3.0 ELECTRONICS: Duet WiFi 1.02 or later FIRMWARE_DATE: 2020-01-03b3

NPN inductive Z probe

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Thu May 07 2020 15:49:06 GMT-0400 (Eastern Daylight Time)

; homex.g
; called to home the X axis
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Thu May 07 2020 15:49:06 GMT-0400 (Eastern Daylight Time)
G91 ; relative positioning
; G1 H2 Z20 F120 ; lift Z relative to current position
M92 X172.00 ; set movement speed to match m915 H param
M201 X100.00 ; reduce acceleration
M566 X100.00 ; reduce maximum instantaneous speed changes (mm/min)
G1 H1 X-1160 F6000 ; move quickly to X axis endstop and stop there (first pass)
; G1 H2 Z-5 F6000 ; lower Z again
G90 ; absolute positioning
M92 X80.00 ; set steps per mm back to default
M566 X900.00 ; set maximum instantaneous speed changes back to normal (mm/min)
M201 X500.00 ; set ac

; homey
G91 ; relative positioning
; G1 H2 Z5 F6000 ; lift Z relative to current position
M92 Y172.00 ; set movement speed to match m915 H param
M201 Y100.00 ; reduce acceleration
M566 Y100.00 ; reduce maximum instantaneous speed changes (mm/min)
G1 H1 Y-1430 F6000 ; move quickly to Y axis endstop and stop there (first pass)
;G1 H2 Z-5:-5 F6000 ; lower Z again
G90 ; absolute positioning
M92 Y80.00 ; set steps per mm back to default
M566 Y900.00 ; set maximum instantaneous speed changes back to normal (mm/min)
M201 Y500.00 ; set accelerations back to normal (mm/s^2)

G91 ; relative positioning
G90 ; absolute positioning
; G1 X5 Y-10 F6000 ; go to first probe point
G30 ; home Z by probing the bed

; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 Z5 F120 ; lift Z relative to current position
;G90 ; absolute positioning

The last question, I don't have an answer to. I used my Prusa Slicer but I didn't see a setting for a start code. I suspect it my ignorance of the software is at least one of my issues. Thank you for any help you can give. I am new to DIY printers.

Phaedrux

@damaged_goods said in Nozzle will not start low enough to print:

FIRMWARE_VERSION: 3.0

Update your firmware by uploading this zip file as is to the /sys folder.

https://github.com/Duet3D/RepRapFirmware/releases/download/3.1.1/Duet2and3Firmware-3.1.1.zip

Phaedrux

@damaged_goods said in Nozzle will not start low enough to print:

I used my Prusa Slicer but I didn't see a setting for a start code.

It's in the printers tab.

Phaedrux

@damaged_goods said in Nozzle will not start low enough to print:

M92 X172.00 ; set movement speed to match m915 H param
M201 X100.00 ; reduce acceleration
M566 X100.00 ; reduce maximum instantaneous speed changes (mm/min)
G1 H1 X-1160 F6000 ; move quickly to X axis endstop and stop there (first pass)
; G1 H2 Z-5 F6000 ; lower Z again
G90 ; absolute positioning
M92 X80.00 ; set steps per mm back to default
M566 X900.00 ; set maximum instantaneous speed changes back to normal (mm/min)
M201 X500.00 ; set ac

It's quite bizarre to alter your steps per mm in a homing file. What is the reasoning?

@damaged_goods said in Nozzle will not start low enough to print:

; G1 X5 Y-10 F6000 ; go to first probe point
G30 ; home Z by probing the bed

What position on the bed are you actually probing? The probe should be positioned at the center.

@damaged_goods said in Nozzle will not start low enough to print:

G31 P500 X-30 Y-36 Z0.66 ; set Z probe trigger value, offset and trigger height

How have you measured the trigger height?

If you haven't already, see here: https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe

damaged_goods

@Phaedrux thank you. This should be very helpful.