Dual z axis, G32, z axis off level
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Hello,
After G32 command the nozzle at the beginning of the x axis is +0.05 off the bed and at the end of the x axis is -0.10
Mesh bed leveling sees the gantry sag before G32. After the G32 command it does not see the sag but it's there.
I'm using Ender 3
left leadscrew is 30mm to the left of the nozzle x0
right leadscrew is 30mm to the right of the nozzle x230 (axis limit)Here is my related config.g
;dual z axis limits M671 X-30:260 Y0:0 S2 ; leadscrews at left (connected to Z) and right (connected to E1) of X axis ;M208 X10:190 Y30:230 ; X carriage moves from -5 to 205, Y bed goes from 0 to 200 ; Axis Limits M208 X0 Y0 Z0 S1 ; set axis minima M208 X230 Y230 Z230 S0 ; set axis maxima ; Z-Probe PINDA M558 P5 C"probe" H3 F300 T6000 A20 S0.005 ; PINDA ;M308 S2 P"e1temp" A"PINDA" Y"thermistor" T100000 B3950 ; PINDA TEMP OK G31 P1000 X-41 Y23 Z0.9 ;G31 P100 X-41 Y23 Z0.585 M557 Y45:195 X30:185 P9 ; define mesh grid OK ; Tools M563 P0 D0 H1 F0 ; define tool 0 ;G10 P0 X0 Y13 Z-0.80 ; set tool 0 axis offsets G10 P0 X0 Y13 Z0 ; set tool 0 axis offsets G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C
and my bed.g
G30 P0 X18 Y115 Z-99999 ; probe near a leadscrew, half way along Y axis G30 P1 X210 Y115 Z-99999 S2 ; probe near a leadscrew and calibrate 2 motors G28 Z
Where are my mistakes?
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As it looks like the correction is going the wrong direction, make sure the left leadscrew motor is plugged into Z and right to E1, and your M584 should be
M584 Z2:4
(rather than Z4:2). The order it is defined matters!Looks like your leadscrews are in the middle of the bed in Y, so change M671 to:
M671 X-30:260 Y115:115 S2
It may make a small difference.
Your probing speed F300 (5mm/s) in M558 is pretty fast, and can lead to inaccuracy; try F120 (2mm/s). Though you do have A20 S0.005 set, so it should probe a number of times anyway.
Ian
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Thank you! setting Y115 worked. I still have issues with inconsistent Z leveling, different order of commands seems to give diffierent results.
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What order are you using? Bare in mind that any change in the tilt of the gantry will change the distance to the bed as well.