cpm64
commented
5 years ago Same problem here, in the rarely times when the BLT is working (complete a G29 without freezing above probing points 5x5 matrix, issue reported here: https://github.com/MNieddu91/Marlin-AI3M-BLTouch/issues/12#issuecomment-513680694) I cannot enable the mesh,
I followed and logged terminal output for every command described in the guide (https://github.com/MNieddu91/Marlin-AI3M-BLTouch/wiki/Adjust-configuration)
G28 ; (homing should be done as usual)
G1 Z20 ; (Raise Z axis)
G1 X110 Y110 Z100 ; (center print head and position at height Z=100)
G29 ; (axis moves to the first measuring point (X10 Y10) , the pin is extended and the print head moves down)
Recv: Bilinear Leveling Grid: Recv: 0 1 2 3 4 Recv: 0 +2.442 +2.550 +2.645 +2.692 +2.690 Recv: 1 +2.420 +2.532 +2.650 +2.687 +2.682 Recv: 2 +2.417 +2.527 +2.625 +2.662 +2.657 Recv: 3 +2.445 +2.535 +2.615 +2.635 +2.607 Recv: 4 +2.412 +2.490 +2.562 +2.560 +2.542 Recv: Recv: X:190.00 Y:225.00 Z:12.46 E:0.00 Count X:15200 Y:18000 Z:6000 Recv: ok [...] Send: M851 Recv: echo:Probe Z Offset: 0.00"
Perform a G29 again, results:
G29
Recv: Bilinear Leveling Grid: Recv: 0 1 2 3 4 Recv: 0 +2.442 +2.550 +2.648 +2.692 +2.695 Recv: 1 +2.422 +2.535 +2.630 +2.690 +2.690 Recv: 2 +2.417 +2.523 +2.617 +2.662 +2.660 Recv: 3 +2.437 +2.532 +2.615 +2.640 +2.620 Recv: 4 +2.407 +2.487 +2.560 +2.557 +2.545 Recv: Recv: X:190.00 Y:225.00 Z:12.46 E:0.00 Count X:15200 Y:18000 Z:6000 Recv: ok
M420 S1 ; Bed leveling ON
Send: M420 S1Recv: echo:Bed Leveling OnRecv: echo:Fade Height OffRecv: ok
Now, the Z-offset calculation:
M211 S0 ; Disable software endstops
G28 ; (homing should be done as usual)
G1 Z5 ; Lift Z 5mm
G29 ; (Approach measuring points with BLTouch)
Recv: Bilinear Leveling Grid: Recv: 0 1 2 3 4 Recv: 0 +2.422 +2.542 +2.628 +2.687 +2.692 Recv: 1 +2.412 +2.517 +2.625 +2.667 +2.675 Recv: 2 +2.410 +2.505 +2.612 +2.657 +2.650 Recv: 3 +2.427 +2.515 +2.605 +2.625 +2.600 Recv: 4 +2.380 +2.455 +2.537 +2.545 +2.530 Recv: Recv: X:190.00 Y:225.00 Z:12.47 E:0.00 Count X:15200 Y:18000 Z:6000 Recv: ok
G1 X110 Y110 Z5 ; (Move print head back to center) G1 Z0G1 Z-0.20...G1 Z-2.50 ; Found it on -2.50
M114 ; Read current positions
Send: M114 Recv: X:110.00 Y:110.00 Z:-2.50 E:0.00 Count X:8800 Y:8800 Z:41 Recv: ok
M851 Z-2.50 M500 ; Store settings in EEPROM G28 ; (homing should be done as usual) G29 ; Execute ABL
Recv: Bilinear Leveling Grid: Recv: 0 1 2 3 4 Recv: 0 -0.072 +0.040 +0.125 +0.175 +0.187 Recv: 1 -0.088 +0.015 +0.125 +0.170 +0.177 Recv: 2 -0.092 +0.010 +0.112 +0.158 +0.155 Recv: 3 -0.072 +0.017 +0.095 +0.125 +0.102 Recv: 4 -0.122 -0.043 +0.037 +0.040 +0.033 Recv: Recv: X:190.00 Y:225.00 Z:17.47 E:0.00 Count X:15200 Y:18000 Z:7000 Recv: ok
G1 X110 Y110 Z5 ; (Move print head back to center) G1 Z1 ; Slow steps, use multiple commands till Z0, this avoid crashing the head to the bed) - The Z0 is correct, the paper is like I set it above.
From this point updated the FW and included #define Z_PROBE_OFFSET_FROM_EXTRUDER -2.50 , reflashed, 'M502, M500', I run the LCD Auto leveling then in Cura just underneath G28 Z0 I added: 'M501 M420 S1'
Tried to print a cube but the head is far above the bed and testing manual X movement it doesn't show me any Z-axis rods movement.
I tried with both the mechanical endstops above the bed level and under the bed level (the head is pushing down the bed by 1-2 mm).
It seems that ABL is ignored.
jimbo2112
I have followed the instructions for calibration and run into an issue. figured out the Z offset to be -1.6. I entered this into my firmware, compiled, and reflashed. I checked the location of the nozzle using G1 Z0 and a 0.13mm feeler gauge. I can just barely slide the gauge between the nozzle and the bed. The 0.15 gauge will not fit. The 0.1 has a visible gap.
After this I went to cura and changed the script per the directions. I added G29 after G28.
The first time it homed, then ran g29, then had an error of "failed to enable bed leveling" I thought maybe it was the M502 and M420 codes from the mesh level. I deleted those 2 and the same problem occurred. Then I tried removing the G29, adding the M502 and M420 codes back. I used the special menu to select "Auto bed leveling" It ran with no problems. I saved the EEPROM and rebooted.
This time the printer ran but I had massive failure right away with bed adhesion and the skirt. I could tell from the get go the nozzle was not close enough. The filament is not squished, rather it was nearly round. As it is printing the distance between the nozzle and the bed appears to be about 1.5 to 2 mm, not the 0.13 or so it should be.
Below is the starting script with the g29 NOT added. G21 ;metric values G90 ;absolute positioning M82 ;set extruder to absolute mode M107 ;start with the fan off G28 X0 Y0 Z0 ;move X/Y to min endstops M501 M420 S1 G0 Z0.15 G92 E0 ;zero the extruded length G1 X40 E25 F500 ; Extrude 25mm of filament in a 4cm line. Reduce speed (F) if you have a nozzle smaller than 0.4mm! G92 E0 ;zero the extruded length again G1 E-1 F500 ; Retract a little G1 X80 F4000 ; Quickly wipe away from the filament line M117 Printing… G5
When I entered the G29 command after the G28 I tired with both with and without the M502 and M420 commands. I did not delete any other command.
Edit: I tried the following script and it did the auto leveling then began to print, however I still have the same issue. I can see a noticeable difference in distance from the hot end to the bed from the auto-level to the actual printing. During the leveling process the gap visually appears to match that of the offset I entered into the firmware, specifically -1.6. During printing the gap appears to be larger, like that offset entered into the firmware is irrelevant.
G21 ;metric values G90 ;absolute positioning M82 ;set extruder to absolute mode M107 ;start with the fan off G28 X0 Y0 Z0 ;move X/Y to min endstops G29 M117 G5