Am I doing something stupid? SOLVED



  • So I had to fit a new fan shroud (which also holds my IR sensor) after a print went wrong and broke it. When I reassembled it I did the usual thing homed, then went down to near the bed, did a g30 s-1 to see the trigger height, then jogged down until I gripped a piece of paper. This gave me a z probe offset of 2.5mm.

    I then autocalibrated and began a print, but my nozzle was about 2mm too high.

    Tried the whole thing again, same result. I also tried with grid levelling on and off. same result.
    No z offset in the gcode.

    config.g

    ; Configuration file for Mini Kossel kit from Think3DPrint3D for testing Duet WiFi
    
    ; Communication and general
    M111 S0                             	; Debug off
    M550 LargeKossel			; Machine name and Netbios name (can be anything you like)
    M551 ************                      	; Machine password (used for FTP)
    ;*** If you have more than one Duet on your network, they must all have different MAC addresses, so change the last digits
    M540 P0xBE:0xEF:0xDE:0xAD:0xFE:0xED 	; MAC Address
    ;*** Wifi Networking
    M552 S1					; Enable WiFi
    
    M555 P2                           	; Set output to look like Marlin
    M575 P1 B57600 S1			; Comms parameters for PanelDue
    
    G21                                 	; Work in millimetres
    G90                                	; Send absolute coordinates...
    M83                                 	; ...but relative extruder moves
    
    ; Axis and motor configuration
    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
    M569 P4 S1				; Drive 4 goes forwards
    M574 X2 Y2 Z2 S1			; set endstop configuration (all endstops at high end, active high)
    ;*** The homed height is deliberately set too high in the following - you will adjust it during calibration
    M665 L360 R145.548 H430.1 B140.0 X-1.125 Y-1.320 Z0.000	; set delta radius, diagonal rod length, print radius, homed height, tower correction 
    M666 X1.561 Y-1.446 Z-0.115 A0.00 B0.00			; put your endstop adjustments here, or let auto calibration find them
    M350 X16 Y16 E16 I1    			; Set 16x microstepping with interpolation
    M92 X200 Y200 Z200			; Set axis steps/mm
    M906 X1100 Y1100 Z1100 E800 I60		; Set motor currents (mA) and increase idle current to 60%
    ;Remember if changing the speeds/accels/jerks below to change bed.g also
    M201 X3000 Y3000 Z3000 E1000		; Accelerations (mm/s^2)
    M203 X15000 Y15000 Z15000 E3600		; Maximum speeds (mm/min)
    M566 X1200 Y1200 Z1200 E1200		; Maximum instant speed changes mm/minute
    
    ; Thermistors
    M305 P0 T100000 B4300 R4700 H30 L0	; Put your own H and/or L values here to set the bed thermistor ADC correction
    M305 P1 T100000 B4388 R4700 H30 L0	; Put your own H and/or L values here to set the first nozzle thermistor ADC correction
    M305 P2 T100000 B3974 R4700 H30 L0	; Put your own H and/or L values here to set the second nozzle thermistor ADC correction
    M307 H1 A423.4 C203.6 D5.1 S1 B0	;autotune parameters for extruder 0 heater (H1) tuned 23-10-16
    M307 H0 A311.7 C649.8 D3.1 S1 B0	;autotune for bed heater H0 tuned 23-10-16
    
    ; Fans
    M106 P1 T45 H1 				; enables thermostatic mode for fan 1, will be on if heater 1/hotend is above 45 deg C
    
    ; LEDs
    M106 P2 S255				;set leds on at max brightness. (runs off fan 1 PWM)
    
    ; Tool definitions
    M563 P0 D0 H1                       	; Define tool 0
    G10 P0 S0 R0                        	; Set tool 0 operating and standby temperatures
    ;*** If you have a single-nozzle build, comment the next 2 lines
    ;M563 P1 D1 H2                      	; Define tool 1
    ;G10 P1 S0 R0                       	; Set tool 1 operating and standby temperatures
    M92 E333	                      	; Set extruder steps per mm
    
    ; Z probe and compensation definition
    ;*** If you have a switch instead of an IR probe, change P1 to P4 in the following M558 command
    M558 P1 X0 Y0 Z0 			; Z probe is an IR probe and is not used for homing any axes
    G31 X10 Y-5 Z2.5 P500			; Set the zprobe height and threshold (put your own values here)
    
    ;*** If you are using axis compensation, put the figures in the following command
    M556 S78 X0 Y0 Z0                   	; Axis compensation here
    
    M208 S1 Z-1				; set minimum Z
    ;
    T0					; select first hot end
    M140 S0					; set extruder to 0 for paneldue
    
    M501					;load config_override.g
    
    

    Bed.g

    ; Auto calibration routine for delta printers
    
    M561					; clear any bed transform, otherwise homing may be at the wrong height
    G28					; home the printer
    G28					;home again in case of endstop problem
    
    ;slow down movement to improve accuracy and magnets holding
    M201 X500 Y500 Z500 E1000		; Accelerations (mm/s^2)
    M203 X15000 Y15000 Z15000 E3600		; Maximum speeds (mm/min)
    M566 X300 Y300 Z300 E1200		; Maximum instant speed changes mm/minute
    
    G30 P0 X0.00 Y120.00 Z-99999 H0
    G30 P1 X75.20 Y89.63 Z-99999 H0
    G30 P2 X109.80 Y19.36 Z-99999 H0
    G30 P3 X95.08 Y-54.89 Z-99999 H0
    G30 P4 X38.37 Y-105.43 Z-99999 H0
    G30 P5 X-40.44 Y-111.11 Z-99999 H0
    G30 P6 X-103.92 Y-60.00 Z-99999 H0
    G30 P7 X-118.18 Y20.84 Z-99999 H0
    G30 P8 X-77.13 Y91.93 Z-99999 H0
    G30 P9 X0.00 Y60.00 Z-99999 H0
    G30 P10 X46.66 Y26.94 Z-99999 H0
    G30 P11 X43.81 Y-25.29 Z-99999 H0
    G30 P12 X0.00 Y-54.74 Z-99999 H0
    G30 P13 X-51.96 Y-30.00 Z-99999 H0
    G30 P14 X-51.96 Y30.00 Z-99999 H0
    G30 P15 X0 Y0 Z-99999 S6
    
    ;restore speed settings to normal printing speeds
    M201 X3000 Y3000 Z3000 E1000		; Accelerations (mm/s^2)
    M203 X15000 Y15000 Z15000 E3600		; Maximum speeds (mm/min)
    M566 X1200 Y1200 Z1200 E1200		; Maximum instant speed changes mm/minute
    
    ;G29 S1					;load grid levelling mesh
    ;M376 H10				;taper off compensation after 10mm
    
    G1 X0 Y0 Z75 F7500			; get the head out of the way of the bed
    
    

    Versions:

    Firmware Name: RepRapFirmware for Duet WiFi
    Firmware Electronics: Duet WiFi 1.0
    Firmware Version: 1.17 (2016-12-24)
    WiFi Server Version: 1.03 (ch fork)
    Web Interface Version: 1.14-b4



  • Update: Something odd is going on.

    I changed my G31 command to have z probe offset 3.6mm instead of 2.5mm to see if it would help. Auto-calibrated then went down to z=0, which was not at physical z=0, jogged down exactly -1.0mm and was at z=0 physically.

    So I changed the z probe offset again to 4.6mm and repeated. This time the same problem, z=0 on the paneldue/web interface positioned the nozzle exactly 1.0mm above the bed. This makes me suspicious its something I am doing wrong.

    The only time the value 1.0mm appears in my config is that I set a z-minimum to -1.0mm to give me the ability to jog down to determine my z-probe offset.


  • administrators

    Bear in mind that if you have M501 in config.g and a config-override.g file, the G31 command in config.g may get overridden.



  • Excellent, as always you've hit the nail square on the head. Yes the config_override.g value was 1.5 giving me the approximately 1.0mm discrepancy. Thank you.



  • So when changing something which effects z probe offset, try a variety of values using G31 and then when you've got the right offset save it with m500?


  • administrators

    @DjDemonD:

    So when changing something which effects z probe offset, try a variety of values using G31 and then when you've got the right offset save it with m500?

    Yes.


Locked
 

Looks like your connection to Duet3D was lost, please wait while we try to reconnect.