BL Touch

droftarts

@Gost101 Looks like it's the bed limits that need to change now. M208 sets the where the bed is in relation to the endstops. For example, at the moment you have:

M208 X0 Y0 Z0 S1                                   ; set axis minima
...
M574 X1 S1 P"xstop"                                ; configure active-high endstop for low end on X via pin xstop
...
G31 P500 X37 Y0 Z2.5                               ; set Z probe trigger value, offset and trigger height

The above effectively says "the X endstop is at the low end (this should be on the left of the X axis, defined by M574), and when the X endstop is triggered, X is set to 0 (defined by M208 X0 S1). The probe is at X37 when the nozzle is at X0 (defined by G31)"

But when the X carriage hits the endstop, the nozzle is off the bed, by what looks to be about 50mm? If you jog X until the nozzle is right on the edge of the bed, it'll be around X50. That's where you want X0, so set M208 X-50 Y0 Z0 S1. Then repeat for the Y axis. Position X0 Y0 should be with the nozzle on the front left corner of the bed.

Ian

Gost101

@peter247 @fcwilt @droftarts The printer homes fine now in addition to making the mesh configuration. Is there any code that I have to put in cura so that it will print based of the bed mesh? This is what I was able to get it to:

droftarts

@Gost101 Great! No, just need to load the mesh before printing; you can put G28 then G29 S1 in the slicer start gcode to load the mesh. Best to probe the bed when it's at temperature, in case heating the bed causes it to change shape.

Not sure why the bed has got a 0.25 mm dip in it; you may want to check it really has. Sometimes it's actually caused by the cables pulling on a loose X carriage, and the bed isn't really that shape.

Ian

Gost101

@fcwilt said in BL Touch:

G1 Z10

@droftarts I'm getting a heater fault notification every time the bed heats up past ~58C when it will heat up to ~70C before the firmware update. Is there a timer or something that I can remove to ignore the fault tripping in config?

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.1.4 on Mon Sep 28 2020 07:45:49 GMT-0600 (Mountain Daylight Time)

; General preferences
G90                                                ; send absolute coordinates...
M83                                                ; ...but relative extruder moves
M550 P"A.C.E."                                     ; set printer name
M918 P1 E4 F2000000                                ; configure direct-connect display

; Network
M551 P"SpaceForceHu2020!!"                         ; set password
M552 S1                                            ; enable network
M586 P0 S1                                         ; enable HTTP
M586 P1 S0                                         ; disable FTP
M586 P2 S0                                         ; disable Telnet

; Drives
M569 P0 S1                                         ; X physical drive 0 goes backwards
M569 P1 S1                                         ; Y physical drive 1 goes backwards
M569 P2 S0                                         ; Z One physical drive 2 goes forwards
M569 P2 S0                                         ; Z One physical drive 2 goes forwards
M569 P3 S0                                         ; E physical drive 3 goes backwards
M584 X0 Y1 Z2 E3                                   ; set drive mapping
M350 X16 Y16 Z16 E16 I1                            ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E415.00                  ; set steps per mm
M566 X1200.00 Y1200.00 Z24.00 E300.00              ; set maximum instantaneous speed changes (mm/min)
M203 X9000.00 Y9000.00 Z180.00 E6000.00            ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z100.00 E5000.00              ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E1000 I50                      ; 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 X500 Y500 Z500 S0                             ; set axis maxima

; Endstops
M574 X1 S1 P"xstop"                                ; configure active-high endstop for low end on X via pin xstop
M574 Y1 S1 P"ystop"                                ; configure active-high endstop for low end on Y via pin ystop
M574 Z1 S2                                         ; configure Z-probe endstop for low end on Z

; Z-Probe
M950 S0 C"exp.heater7"                             ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F600 T9000                ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X37 Y0 Z2.150                               ; set Z probe trigger value, offset and trigger height
M557 X30:470 Y30:470 S25                           ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4092     ; 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 B1 S1.00                                   ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0                                            ; map heated bed to heater 0
M143 H0 S70                                        ; set temperature limit for heater 0 to 70C
M308 S1 P"e0temp" Y"thermistor" T100000 B4092      ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1                               ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00                                   ; disable bang-bang mode for heater  and set PWM limit

; Fans
M950 F0 C"fan0" Q500                               ; create fan 0 on pin fan0 and set its frequency
M106 P0 S1 H-1                                     ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                               ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45                                  ; set fan 1 value. Thermostatic control is turned on
M950 F2 C"fan2" Q500                               ; create fan 2 on pin fan2 and set its frequency
M106 P2 S1 H1:0 T45                                ; set fan 2 value. Thermostatic control is turned on

; Tools
M563 P0 S"Hot end" H1 D0 F1:2                           ; define tool 1
G10 P1 X0 Y0 Z0                                    ; set tool 1 axis offsets
G10 P1 R0 S0                                       ; set initial tool 1 active and standby temperatures to 0C


; Custom settings are not defined

; Miscellaneous
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss

Gost101

The error is as follows:

Error: Heater 0 fault: temperature rising much more slowly than expected 1.8*C/sec

jay_s_uk

PID tune the bed using

M303 H0 S70

Save the values using

M500

Then either copy the values from the config-override to your config.g or add M501 to the end of config.g

Gost101

at around~63*C the M303 fails @jay_s_uk

droftarts

@Gost101 See https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control#Section_Troubleshooting_auto_tuning

If auto tuning fails with a message that the temperature is not rising fast enough, this indicates that either you are using too low a P value in the M303 command, or the dead time in the existing model is much too low for your heater. You can increase the dead time using the M307 command. For example, sending M307 H0 D30 will increase the dead time to 30 seconds. The actual dead time will be known after a successful auto tuning.

Edit: Send M307 H0 to see current settings.

Edit2: Has the bed always heated really slowly?

Ian

Gost101

@droftarts The bed has always heated slowly

	M307 H0
Heater 0 model: gain 340.0, time constant 140.0, dead time 5.5, max PWM 1.00, calibration voltage 0.0, mode bang-bang

droftarts

@Gost101 send M307 H0 D30 and try tuning again. Sounds like the bed heater is underpowered for the bed size.

Ian

Gost101

@droftarts said in BL Touch:

M307 H0 D30

Here is the image from the tuning:

Phaedrux

Is the heated bed wired for 24v but using 12v for VIN or something?

Gost101

@Phaedrux just a generic creality 12v heated bed.

Phaedrux

Is there a fan blowing on or near it causing a draft?

Gost101

@Phaedrux There is not. I'm wanting to upgrade my bed to a keenvoo but don't have the money at the moment.

dc42

What was the indicated bed temperature when you started tuning the bed heater? The low calculated A parameter suggests to me that it was well above room temperature, for example 45C or more.

Gost101

@dc42 The room temperature is 22.9C but can be low as 15.5C. The target temperature of the bed is 70*C.

dc42

@Gost101 said in BL Touch:

@dc42 The room temperature is 22.9C but can be low as 15.5C. The target temperature of the bed is 70*C.

Hmm, very odd then that it reported a gain (A parameter) of 30.8. The computed gain should be higher than the temperature rise during tuning. So if the indicated bed temperature was 22.9C when you started tuning, and it reached 70C, then the gain should be greater than 47. OTOH if the bed was already at e.g. 45C then you started tuning, then the computed gain would indeed be much lower than it really is. Tuning must start with the heater reading close to room temperature.

You could try using M307 H0 A55 C297 D23.

Gost101

@dc42 said in BL Touch:

M307 H0 A55 C297 D23

I appreciate it. I just ran

M307 H0 A55 C297 D23

Then I started:

M303 H0 S70

Hopefully it will work out.

Gost101

@dc42 This is the result:

9/29/2020, 2:16:35 PM	Auto tune heater 0 completed in 2457 sec
Use M307 H0 to see the result, or M500 to save the result in config-override.g
9/29/2020, 2:03:47 PM	Auto tune phase 3, peak temperature was 70.0
9/29/2020, 2:03:43 PM	Auto tune phase 2, heater off
9/29/2020, 1:35:43 PM	Auto tune phase 1, heater on
9/29/2020, 1:35:38 PM	M303 H0 S70
Auto tuning heater 0 using target temperature 70.0°C and PWM 1.00 - do not leave printer unattended
9/29/2020, 1:35:04 PM	M307 H0 A55 C297 D23