Bed leveling with 3 independent z screws
mundsen last edited by mundsen
2 z screws on the left side and one on the right side + BlTouch running Duet3
Anyone want to share settings for this?
Status today (railcore inspired printer) :
All axis ok
X and y limit switch ok
Waiting for the tool board for the extruder.. wires
Sounds like this is similar to a RailCore.
This what we use for levelling.
M140 S75 ; Raise bed temp to profile requested bed temp
M104 S150 T0 ; Raise hot-end temp to 150C for G32 auto-calibration
M190 S75 ; Wait for bed temp to rise
M109 S150 T0 ; Wait for hot-end temp to rise to 150C
G28 ; home all axes
G32 ; Autocalibrate bed
G32 ; Autocalibrate bed a second time
G32 ; And a third time ( for 4 point probe)
You also need to make sure your leadscrew locations are defined.
My Bad! Forgot to say we use this in our slicer config!
If you look at https://railcore.org/software/ there are base configs for the Duet2.
Danal last edited by
I have a very slightly different setup, two "in front" and one in "Center back". I believe you can update this fairly easily.
Relevant statements extracted from config.g:
; Driver to axis mapping M584 X0 Y1 U2 Z3:4:5 ; X and Y for CoreXY. U for toolchanger lock. Z has three drivers for kinematic bed suspension. M569 P3 S0 ; Drive 3 direction | Front Left Z M569 P4 S0 ; Drive 4 direction | Front Right Z M569 P5 S0 ; Drive 5 direction | Back Z ; Leadscrew locations (really, kinematic coupling locations) extracted from CAD model assuming back right build plate corner is (0, 0) M671 X300:5:152.5 Y316:316:-14 S10 ; Front Left: (300, 316) | Front Right: (5, 316) | Back: (-14, 152.5) M350 Z16 I1 ; Set 16x microstepping for axes. Use interpolation. M906 X2500 Y2500 Z1000 E1250 I30 ; Motor currents (mA) and Idle percentage M201 X600 Y600 Z10 E1000 U1000 ; Accelerations (mm/s^2) M203 X25000 Y25000 Z400 E4000 U10000 ; Maximum speeds (mm/min) M566 X700 Y700 Z2 E3000 U200 ; Maximum jerk speeds mm/minute M92 Z3200 ; Steps/mm for Z - TR8*4 / 0.9 deg stepper
And bed.g (note that front left is a little offset in Y because of a temporary thing that blocks that corner of the bed):
G0 X152.5 Y40 H1 F10000 G30 P0 X152.5 Y40 Z-99999 ; probe near back leadscrew G0 X275 Y260 H1 F10000 G30 P1 X275 Y260 Z-99999 ; probe near front left leadscrew G0 X25 Y315 H1 F10000 G30 P2 X25 Y315 Z-99999 S3 ; probe near front right leadscrew and calibrate 3 motors G1 X0 Y0 F10000