Hi @dc42.

Yes, I followed the exact directions found in the documentation for "Measuring Trigger Height" here. Yet somehow, I received all sorts of values from measuring the same dead-center spot.

I'm wondering if my printer is in the Bermuda Triangle.

I'll change the M558 F value to F200 tonight.

• Question: In the bed.g, what should the G31 values be? Should the XYZ values be equal to zero or something else (e.g. should they match the G31 line from config.g)?

Thanks @dc42

@dc42 said in Beginner Needs Help - Anycubic Kossel Plus + Duet WiFi -- HOW?:

@mindbender9, please clarify what type of Z-probe you are using. I was assuming it was my own IR sensor, but skimming through this rather long thread, I found user @3mm mentioning the IR sensor but no confirmation that you are using one too.

Hi @dc42 - The IR sensor that I'm using is the "Mini differential IR height sensor" - I believe this might be one that you designed.

It is currently mounted on my hot-end with an offset of 32.82mm (distance from the nozzle).

@dc42 said in Beginner Needs Help - Anycubic Kossel Plus + Duet WiFi -- HOW?:

1. Is the variance is between probing at different points?

All points were for the same position. Dead center, at the middle of the bed.

Inconsistency in the trigger height for the IR sensor can also be due to using a transparent bed surface (e.g. glass or PEI) that is not backed by a black surface, or that has scuff marks on the top.

Using a replacement black bed top from the manufacturer.

2. If your initial delta parameters are a long way out, that could cause probe points to be outside the bed limits. Try a smaller probing radius. You can always move some of the probe points further out when you have it working.

Will do. I’ll reduce the quantity of probe points using the wizard and see what happens.

Question for @dc42 - What should be entered for G31 in the bed.g file? Should the XYZ values match the config.g G31 line or should they be zeroed out?

So I performed a number of Trigger Height measurements tonight and only two of the ten tests were even close. I don't understand why there's such a variance between the numbers.

Z-Height #1: 2.377
Z-Height #2: 3.953
Z-Height #3: 2.641
Z-Height #4: 3.09
Z-Height #5: 3.391
Z-Height #6: 4.415
Z-Height #7: 2.103
Z-Height #8: 3.628
Z-Height #9: 3.653
Z-Height #10: 3.516

Now, two of the Auto Calibration points land outside of the bed. And I'm unable to change these outside positions no matter what G1 Xx Yy Z99999 H0 values I save to the bed.g file. It's like the board isn't reading the bed.g file. What happened?

What do I do now?

@dc42 said in Beginner Needs Help - Anycubic Kossel Plus + Duet WiFi -- HOW?:

Measure the IR sensor trigger height and use that value in the G31 Z parameter instead.

• When you say to measure the trigger height for the IR sensor, what height would that be? Is that the Z-position from the bed to the bottom of the sensor? But at what height? I'm don't understand.

Edit: I'll go over the "Measuring the trigger height" section of your instructions when I get home. Thanks!

One other question:

• The G31 line from the bed.g file says:

G31 X0 Y0 Z20

While the config.g line has:

G31 X0 Y-32.82 Z0 P500

Question: Should the two G31 lines match in both files?

Thanks for your help!

Terrible results when I try to print.

• Good News: I've taken care of the Z-probe setup. I changed the bed.g file settings to only use three calibration points and it worked. So I went back to the 10-point settings and changed any that went off the bed. When I click Auto-Delta Calibration, all 10 calibration points now complete successfully - the nozzle comes within 0.2mm of the bed, the Z-probe LED flashes and the nozzle retracts then goes to the next point. I have placed the M500 code at the end of bed.g and M501 at the end of config.g.

• Bad News: Whenever I upload a gcode file of a 0.2mm test circle (after performing a calibration prior), the nozzle buries itself hard into the bed. Every time. And while I am not fast enough to power off the nozzle (it's dropping that fast), I think I'm at my last ropes here. I'm attaching whatever config files I have at this point.

• More Bad News: The Duet Wifi web interface keeps disconnecting when I open the webpage in either Google Chrome or Microsoft Edge. It takes 30 seconds or more to allow me to reconnect, or I have to manually restart the board.

• Question: Why does the nozzle bury itself into the bed when I just auto-calibrated the printer a few seconds before? Why is there a height difference that puts the Z-position below the bed after the auto-calibration?

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 Sun May 13 2018 19:16:40

; General preferences
G90					; Send absolute coordinates...
M83					; ...but relative extruder moves
M555 P1					; Set firmware compatibility to look like RepRapFirmare

;*** The homed height is deliberately set too high in the following - you will adjust it during calibration.
M665 R134 L270 B85 H300		; 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

; Network
M550 Pduettest
M552 S1					; Enable network
M586 P0 S1				; Enable HTTP
M586 P1 S0				; Disable FTP
M586 P2 S0				; Disable Telnet

; Z-Probe 
M558 P1 X0 Y0 Z0 H30 F1000 T5000 ;I1 		; Set Z probe type to DC42 and the dive height + speeds
G31 X0 Y-32.82 Z0 P500				; Set Z probe trigger value, offset and trigger height
M557 R80 S20					; Define mesh grid

; Drives
M569 P0 S1					; Drive 0 goes forwards
M569 P1 S1					; Drive 1 goes forwards
M569 P2 S1					; Drive 2 goes forwards
M569 P3 S1					; Drive 3 goes forwards
M350 X16 Y16 Z16 E16 I1				; Configure microstepping with interpolation
M92 X80 Y80 Z80 E96				; 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 X1000 Y1000 Z1000 E800 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

; Heaters
M305 P0 T100000 B4267 C0 R4700			; Set thermistor + ADC parameters for heater 0
M143 H0 S120					; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B4267 C0 R4700			; Set thermistor + ADC parameters for heater 1
M143 H1 S275					; Set temperature limit for heater 1 to 275C

; 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 H1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P2 S1 I0 F500 H1 T45 ; 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 saving after power loss is not enabled 
M501

; Custom settings are not configured

bed.g:

; bed.g
; called to perform automatic delta calibration via G32
;
; generated by RepRapFirmware Configuration Tool on Sun May 13 2018

M561 			; clear any bed transform
G31 X0 Y0 Z20		; POSSIBLE PROBLEM WITH Z=32.82
;G31 X0 Y0 Z32.82		; don't want any probe offset for this - ADDED 5/21/2018
G28			; home the printer

M401			; deploy the Z probe

; bed.g file for RepRapFirmware, generated by Escher3D calculator
; 10 points, 6 factors, probing radius: 105, probe offset (0, 0)
M98 Pdeployprobe.g
G30 P0 X0.00 Y105.00 Z-99999 H0
G30 P1 X90.93 Y52.50 Z-99999 H0
G30 P2 X55.00 Y-65.00 Z-99999 H0
G30 P3 X0.00 Y-80.00 Z-99999 H0
G30 P4 X-72.00 Y-50.00 Z-99999 H0
G30 P5 X-87.00 Y52.50 Z-99999 H0
G30 P6 X0.00 Y52.50 Z-99999 H0
G30 P7 X45.47 Y-26.25 Z-99999 H0
G30 P8 X-45.47 Y-26.25 Z-99999 H0
G30 P9 X0 Y0 Z-99999 S6
M98 Pretractprobe.g

M402 ; retract the Z probe

G1 X0 Y0 Z150 F15000 ; get the head out of the way of the bed

M500 ; Save results

homedelta.g:

; homedelta.g
; called to home all towers on a delta printer
;
; generated by RepRapFirmware Configuration Tool on Sun May 13 2018

G91                        ; relative positioning
G1 S1 X400 Y400 Z400 F1800 ; move all towers to the high end stopping at the endstops (first pass)

G1 X-5 Y-5 Z-5 F1800 S2    ; go down a few mm
G1 S1 X10 Y10 Z10 F360     ; 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

Edit: Hi @dc42 - Changing the Y-value did not change anything with the nozzle. The hot-end/IR probe went to the same position as it did on previous attempts. No change.

@danal said in Beginner Needs Help - Anycubic Kossel Plus + Duet WiFi -- HOW?:

Try a radius of 105, for diameter of 210, to keep things well away from the edges. If that works, you may be able to raise it slightly, watching for the edges. To start with, something like M557 R105 S20

Hi @Danal,

I changed the M557's R value to R105, R90 and R80 but the third stop of the autocalibrate still ran into issues (regardless of the R-value the was set).

With R105, it looks like the IR probe is just hovering outside of the edge of the bed, while the nozzle is inside the bed area. When I started lowering the R-value, the IR probe position didn't change. Here's a picture:

So it looks like the IR probe doesn't see the bed and keeps dropping, while the nozzle is inside the area of the bed, and this ends with nozzle contact as a result. And lowering the R-value doesn't not change this position.

I think we're close, but the nozzle's refusal to reflect any of the R-values is odd.

@juice

Hopefully, you'll be able to recognize something from these pictures.

View from front between X and Y motors:

View from right side between Y and Z motors:

View from left side between X and Z motors:

@danal

I increased the M665 H parameter to 300, and then changed the bed.g G31 line to: G31 X0 Y32.82 to account for the IR probe distance from the nozzle. I then ran auto-calibrate.

While the nozzle didn't bury itself, it did move outside the bed on the third survey while auto-calibrating. Here's a picture to show what I'm describing:

Both the IR Probe and the nozzle are outside the circular bed/printable area. I stopped the auto-calibration at this point.

Any idea how to correct this? I think we're getting close.