Hi,
so I use these commands to level the bed using the BL touch probe:
G28
G29 P1
Mesh invalidated. Probing mesh.
Probing mesh point 1/9.
Probing mesh point 2/9.
...
Probing mesh point 9/9.
G29 T
Bed Topography Report:
( 5,220) (200,220)
0 1 2
2 | -2.099 -0.667 -0.043
|
1 | -0.464 -0.105 [+0.365]
|
0 | +0.153 +0.377 +0.664
0 1 2
( 5, 15) (200, 15)
G29 S0 -- save to slot 0
G29 A -- activate
M500 -- save everything
This works just fine. Repeatability can be tested using G29 K0 and it's below 0.01 mm if I do not touch anything between the probes.
But now comes the Z offset. I think I am doing something wrong here.
I use M290 babystepping to finetune the Z offset. But it somehow varies a lot.
I only get good results if I do a G29 P1, then immediately the Z offset and then printing.
If there is anything between printing and offset it just is off again.
G28 Z -- so it moves the head to the center of the bed
-- put paper under the head
G1 Z0 -- move head down to where printer thinks is zero.
M851 -- check settings
M851 X-45.00 Y-5.00 Z-0.8 ; (mm)
M290 Z-0.1 -- or similar until I just feel some resistance moving the paper
M500 -- save again
before every print I do homing and 3 point leveling to have the bed's tilt.
G28
G29 L0 ; Load UBL mesh values from slot 0.
G29 J ; Probe 3 points and tilt the mesh to the plane.
Should I save after G29 J?
PS yes I tried leveling with heated bed as well.
Marlin
2.1.x Bugfix from current bugfix branch.
Hardware:
Creality Ender 3 Pro STM32 427 BLtouch
Creality CR10-S5 STM32 427 BLtouch
thank you very much
