Always misaligned after 3 point probing (3 stepper)
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Hi! -
So im building a D-bot with a custom Z-axis -
The Z axis uses 3 independent steppers and the DC42 IR probe. - But after running the G32, the X-axis is alway tilted a bit -
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What can cause this?
My config file looks like:M586 P0 S1 ; Enable HTTP M586 P1 S0 ; Disable FTP M586 P2 S0 ; Disable Telnet ; Drives M569 P0 S1 ; Drive 0 goes forwards M569 P1 S0 ; Drive 1 goes backwards M569 P2 S1 ; Drive 2 goes forwards M569 P3 S1 ; Drive 3 goes forwards M569 P4 S1 C65972 ; Drive 4 goes forwards M569 P5 S1 ; Drive 5 goes forwards M569 P6 S1 ; Drive 6 goes forwards M569 P7 S1 ; Drive 7 goes forwards M569 P8 S1 ; Drive 8 goes forwards M569 P9 S1 C65972 ; Drive 9 goes forwards M584 X4 Y9 Z0:1:2 E6:7 ; Apply custom drive mapping M350 X16 Y16 Z16 E16:16 I1 S2 ; Configure microstepping with interpolation M92 X200 Y200 Z800 E415:415 ; Set steps per mm M566 X1500 Y1500 Z18 E300:300 ; Set maximum instantaneous speed changes (mm/min) M203 X8400 Y8400 Z800 E2400:2400 ; Set maximum speeds (mm/min) M201 X500 Y300 Z250 E250:250 ; Set accelerations (mm/s^2) M906 X1200 Y1200 Z1000 E1500:1500 I40 ; Set motor currents (mA) and motor idle factor in percent M84 S10 ; Set idle timeout ; Axis Limits M208 X0 Y0 Z0 S1 ; Set axis minima M208 X320 Y290 Z500 S0 ; Set axis maxima ; Define the X and Y coordinates of the leadscrews. ; Must come after M584 (Set drive mapping), M667 (Select CoreXY Mode) and M669 (Choosing Kinematics type) ; Motor order: Front right (1), front left (2), rear center (3). ; Snn Maximum correction in mm to apply to each leadscrew (optional, default 1.0) M671 X-50:385.0:385.0 Y170:35:310 S20 P2 ; Endstops M574 X1 Y1 S3 ; Set endstops controlled by motor load detection ; Z-Probe M574 Z1 S2 ; Set endstops controlled by probe M558 P1 H5 F620 T6000 ; Set Z probe type to modulated and the dive height + speeds G31 P500 X0 Y47 Z3 ; Set Z probe trigger value, offset and trigger height M557 X20:320 Y50:280 S20 ; Define mesh grid ; Heaters M305 P0 T100 B4202 C4.387169e-7 R4700 ; Set thermistor + ADC parameters for heater 0 M143 H0 S80 ; Set temperature limit for heater 0 to 80C M305 P1 T100000 B4725 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 1 M143 H1 S360 ; Set temperature limit for heater 1 to 360C M305 P2 T100000 B4725 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 2 M143 H2 S360 ; Set temperature limit for heater 2 to 360C ; 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 H1:2 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on M106 P2 S1 I0 F500 H1:2 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 M563 P1 D1 H ; Define tool 1 G10 P1 X18 Y0 Z0 ; Set tool 1 axis offsets G10 P1 R0 S0 ; Set initial tool 1 active and standby temperatures to 0C ; Automatic saving after power loss is not enabled ; Custom settings are not configured ; Miscellaneous M501 ; Load saved parameters from non-volatile memoryHome all
; homeall.g ; called to home all axes ; ; generated by RepRapFirmware Configuration Tool on Tue Jul 31 2018 15:05:50 GMT+0200 (Centraleuropæisk sommertid) M400; make sure everything has stopped before we make changes M574 X1 Y1 S3 ; M913 X30 Y30 ; XY motors to 30% current M915 X Y H400 S3 R0 F0 ; set X and Y to sensitivity , do nothing when stall, unfiltered ; X axis home G91 ; use relative positioning G1 Z5 F6000 S2 ; lift Z relative to current position G1 S1 X-405 F6000 ; move quickly to X axis endstop and stop there (first pass) G1 X5 F6000 ; go back a few mm G1 S1 X-405 F4000 ; move slowly to X axis endstop once more (second pass) ; Y axis home G1 S1 Y-305 F6000 ; move quickly to Y axis endstop and stop there (first pass) G1 Y5 F6000 ; go back a few mm G1 S1 Y-305 F4000 ; move slowly to Y axis endstop once more (second pass) G90 ; absolute positioning M913 X100 Y100; motor currents back to 100% ; Z-axis M561 ; Clear any bed transform G32 ; Start 3-point probe sequence - Bed.g G1 Z20.0 F6000 ; Move Z to 20 G1 X5 Y5 ; Move Head to front leftand my bed.g:
; bed.g ; called to perform automatic bed compensation via G32 ; ; generated by RepRapFirmware Configuration Tool on Tue Jul 31 2018 15:05:50 GMT+0200 (Centraleuropæisk sommertid) M561 ; clear any bed transform M117 g28; G28 Z; G29 S2; Clear bed height map ; Probe the bed at 3 points G30 P0 X0 Y160 Z-9999 ; Front Right G30 P1 X320 Y47 Z-9999 ; Front Left G30 P2 X320 Y280 Z-9999 S3 ; Center RearIt is always the same error where the right side (x+) is lower than the left side (x-)
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First guess is that the order of your steppers on the board doesn't match the order you have them configured.
M584 X4 Y9 Z0:1:2 E6:7 ; Apply custom drive mapping
That order for the Z steppers needs to match the order here:
M671 X-50:385.0:385.0 Y170:35:310 S20 P2
If not, the corrections applied will be to the wrong leadscrew.
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that helped a bit
Still a bit much noise it looks like - The bed should be pretty flat - It is an 6mm cast aluminium (similar to MIC6 ) and have a printsheet on top (chinese magnetic buildtak)
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Is the buildtak sheet reflective?
I suggest setting a sheet of paper on top of the bed and trying again.
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Yes, it looks like the IR sensor doesn't work well with that bed surface. What does the surface look like?
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@dc42
Right now it is a little bit blank - it is the magnetic part of one of those aliexpress magnetic print surface - Will try with the print surface on when i get back (the Matt print surface you print on the magnetic sheet)
