DWC UI position updates are behind causing leveling problems

dc42

@3ddevil, thanks for your report and video. I confirm two problems in firmware 2.01beta1 which are almost certainly also present in 2.0/1.21 and perhaps in some earlier versions too:

M561 disables bed compensation, but if bed compensation was previously enabled then it doesn't adjust the user Z coordinate to take account of whatever compensation was previously applied at the current XY position. Repeating M561 has no effect, however sending G29 S2 after M561 does adjust the coordinate.
G29 S2 disables bed compensation, but the first time it is run it doesn't update the user Z coordinate.

I will fix these in the next 2.01 beta release.

Phaedrux

@dc42 Would this explain why I'm having trouble getting correct first layer heights? No matter what height I set I end up having to baby step extra height.

dc42

@phaedrux said in DWC UI position updates are behind causing leveling problems:

@dc42 Would this explain why I'm having trouble getting correct first layer heights? No matter what height I set I end up having to baby step extra height.

Possibly!

Phaedrux

@dc42 Would it be best to use the following as a homing order before a print?

T0 ; Activate Tool 0
M190 S[First layer bed temp] ; Wait for bed temp
G10 P0 S[First layer nozzle temp] R100 ; Set Tool 0 to 210 active 100 standby
M561 ; Disable bed compensation.
G29 S2 ; Disable compensation again.
G28 ; Home all
G29 S1 ; Load heightmap.csv and enable compensation.
G90 ; Absolute positioning
G1 X0 Y270 F6000 ; Move to front left corner
G1 Z0.3 F300; Move Z to prime height
M400 ; clear movement buffer
M116 ; Wait for temps
G91 ; Relative positioning
M83 ; Relative extrusion
G1 X40 Y0 E10 F300 ; Prime nozzle
G1 Y-1 E-0.5 F6000 ; Wipe nozzle
G90 ; Absolute positioning
G1 Z[First layer height] F300
; Start print Gcode
G10 ; retract
; Skirt and brim gcode
; Model Gcode

dc42

G29 S2 twice would be better than M561 followed by G29 S2.

Phaedrux

@dc42 I don't think that's helped. Is it possible for that error to have propagated through measuring the probe trigger height?

Phaedrux

@dc42 It would appear that it does effect the trigger height calibration.

I re ran G30 S-1 again with G29 S2 twice before and the resulting Z offset is 2.4 now, whereas before it was 2.1.

Phaedrux

@dc42 I started bed leveling from scratch. Ran G28, G29 S2 twice, G28 again before manually leveling the bed, Then did the same before measuring Z probe trigger height. Got 2.000 this time. Put that in config and reran mesh compensation. And now with G28, G29 S2, G29 S2, G28, G29 S1 before a print I get perfect first layers again.

pro3d

So is there a bug here?

When I home Z I should have a reading of what Z offset is (1.4) but it reports typically 1.3x-1.4x on the first dive.

Here is the homez:
M280 P3 S160 I1 ; Alarm Release and Push-Pin UP
G29 S2 ; Clear Bed Comp
M558 P9 H5 F300 T6000 ; probe, fast one probe
G30 ; calibrate Z-axis
M558 P9 H4 F120 T6000 A3 S0.04 ; probe, slow, multi-probe
G30 ; find Z again

DroneOn

@dc42 loaded Beta2 today on my Maestro and can confirm that the need to run two G29 S2s has been resolved. Thanks for the quick repair on this.