TEVO Little Monster and bltouch conversion problem

RafB

I'm not good at electronics and code but apparently I like to hurt myself.

I converted my Tevo LM to duet. I followed the tutorial How to Install a DUET board on Delta Style 3D Printer - The TEVO Little Monster and all went well except that I can not configure the bltouch. I probably misunderstood his tutorial because I'm French and I do not understand English well. Yes, it does a lot of things that I do not understand but ...

I had a lot of problem with the bltouch. I fixed one of the bltouch problems by following this tutorial. https://www.youtube.com/watch?v=wq5QmN-MIJA

After fixing this problem I started the calibration and everything went well.

![alt text]( 0_1533151931721_Capture d’écran 2018-08-01 à 19.04.58.png image url)

But at the time of starting the printing, the printer starts again the calibration and starts the printing but the nozzle is about 1mm above. I do not understand why ?

Config.g
; Configuration file for Duet WiFi (firmware version 1.20 or newer)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Fri Jul 20 2018 10:07:42 GMT+0200 (CEST)

; General preferences
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves

;*** The homed height is deliberately set too high in the following - you will adjust it during calibration.
M665 R155 L397.19 B155 H520 ; Set delta radius, diagonal rod length, printable radius and homed height
M666 X0 Y0 Z0 ; Put your endstop adjustments here, or let auto calibration find them

; Drives
M569 P0 S1 ; Drive 0 goes forwards
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S1 ; Drive 2 goes forwards
M569 P3 S0 ; Drive 3 goes forwards
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X80 Y80 Z80 E417.22 ; Set steps per mm
M566 X1200 Y1200 Z1200 E1200 ; Set maximum instantaneous speed changes (mm/min)
M203 X18000 Y18000 Z18000 E1200 ; Set maximum speeds (mm/min)
M201 X1000 Y1000 Z1000 E1000 ; Set accelerations (mm/s^2)
M906 X1200 Y1200 Z1200 E1200 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 Z0 S1 ; Set minimum Z

; Endstops
M574 X2 Y2 Z2 S1 ; Set active high endstops

; Z-Probe
M307 H3 A-1 C-1 D-1 ; Disable heater on PWM channel for BLTouch
M558 P9 H5 F120 T6000 ; F120 T6000 Set Z probe type to bltouch and the dive height + speeds
G31 P25 X0 Y20 Z0.627 ; Set Z probe trigger value, offset and trigger height
M557 R155 S45 ; Define mesh grid

; Heaters
M301 H0 S1.00 P10 I0.1 D200 T0.4 W180 B30 ; Use PID on bed heater (may require further tuning)
M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S300 ; Set thermistor + ADC parameters for heater 0

; Fans
M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P2 S1 I0 F500 H0 T50 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 ; 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

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

; Custom settings
;M591 D0 C3 P2 E6.0

; Miscellaneous
M501 ;Load save parameters from non-volatile memory

Bed.g
; bed.g
; called to perform automatic delta calibration via G32
;
; generated by RepRapFirmware Configuration Tool on Fri Jul 20 2018 10:07:42 GMT+0200 (CEST)
M561 ; clear any bed transform
G28 ; home all towers
M190 S60
M98 Pdeployprobe.g ; deploy mechanical Z probe
; Probe the bed at 6 peripheral and 6 halfway points, and perform 6-factor auto compensation
; Before running this, you should have set up your Z-probe trigger height to suit your build, in the G31 command in config.g.
G30 P0 X0 Y132.28 H0 Z-99999
G30 P1 X121 Y69.86 H0 Z-99999
G30 P2 X129.9 Y-75 H0 Z-99999
G30 P3 X0 Y-150 H0 Z-99999
G30 P4 X-129.9 Y-75 H0 Z-99999
G30 P5 X-121 Y69.86 H0 Z-99999
G30 P6 X0 Y59.15 H0 Z-99999
G30 P7 X56.09 Y32.38 H0 Z-99999
G30 P8 X64.95 Y-37.5 H0 Z-99999
G30 P9 X0 Y-75 H0 Z-99999
G30 P10 X-64.95 Y-37.5 H0 Z-99999
G30 P11 X-56.09 Y32.38 H0 Z-99999
G30 P12 X0 Y0 H0 Z-99999 S6
; Use S-1 for measurements only, without calculations. Use S4 for endstop heights and Z-height only. Use S6 for full 6 factors
; If your Z probe has significantly different trigger heights depending on XY position, adjust the H parameters in the G30 commands accordingly. The value of each H parameter should be (trigger height at that XY position) - (trigger height at centre of bed)
M98 Pretractprobe.g ; retract mechanical Z probe
G29

Homedelta.g
; homedelta.g
; called to home all towers on a delta printer
;
; generated by RepRapFirmware Configuration Tool on Fri Jul 20 2018 10:07:42 GMT+0200 (CEST)
G91 ; relative positioning
G1 S1 X705 Y705 Z705 F3600 S1 ; move all towers to the high end stopping at the endstops (first pass)
G1 X-5 Y-5 Z-5 F3600 S2 ; go down a few mm
G1 S1 X10 Y10 Z10 F360 S1 ; move all towers up once more (second pass)
G1 Z-5 F6000 ; move down a few mm so that the nozzle can be centred
G90 ; absolute positioning
G1 X0 Y0 F6000 ; move X+Y to the centre

Start script
startingGcode,G28 ; home all axes,M98 Pbed.g,G92 E0 ; zero extruder,M98 PpurgeBeforePrint.g ; Purge the extruder along the front of the printer

thank you in advance for the help

mrac1

Your trigger value (Z0.67) seems a bit too low, try about 1.5

Like this, but you should start with 1.0 for the first try:
; G31 P25 X0 Y20 Z0.627 ; Set Z probe trigger value, offset and trigger height
G31 P25 X0 Y20 Z1.5 ; Set Z probe trigger value, offset and trigger height

RafB

Thank you for your help, I will try but the few tests I have in Z + and Z- nothing changes

mrac1

@rafb It's a couple of month ago I've used the TLM with the BL-Touch (I'm using a microswitch instead) but I had also this script in my slicer startcode:

M280 S10.6 ;bl-touch reset
M280 S3 ;bl-touch pin down
G30 Z1.55 ;z-probe + distance to BLT !!! higher value -> lower nozzle !!!
M280 S7 ;bl-touch pin up

Phaedrux

@mrac1 said in TEVO Little Monster and bltouch conversion problem:

@rafb It's a couple of month ago I've used the TLM with the BL-Touch (I'm using a microswitch instead) but I had also this script in my slicer startcode:

M280 S10.6 ;bl-touch reset
M280 S3 ;bl-touch pin down
G30 Z1.55 ;z-probe + distance to BLT !!! higher value -> lower nozzle !!!
M280 S7 ;bl-touch pin up

Did you mean G31 Z1.55?

@RafB I'm not a delta user, but doesn't this need to be addressed?

;*** The homed height is deliberately set too high in the following - you will adjust it during calibration.
M665 R155 L397.19 B155 H520 ; Set delta radius, diagonal rod length, printable radius and homed height
M666 X0 Y0 Z0 ; Put your endstop adjustments here, or let auto calibration find them

Also I'm not sure if this is correct for a delta or not but seems odd to me at first glance:

; Axis Limits
M208 Z0 S1 ; Set minimum Z

Also, what version of firmware are you using?

Phaedrux

Just saw your other post here: https://forum.duet3d.com/post/57037

So it looks like the BLTouch is functioning correctly, but your homed height is still off?

Can you try updating your firmware to 2.01? There was a homing height bug that was fixed that may be what is effecting you. You may need to rerun your calibration and mesh grid mapping after updating to clear any residual height errors.

RafB

To not do too much duplication, I also answered DC42.

https://forum.duet3d.com/topic/6106/configurator-bltouch-bug/5