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Major issues with klipper and bed levelling (feddit.dk)

submitted 9 months ago* (last edited 9 months ago) by [email protected] to c/[email protected]

15 comments fedilink hide all child comments

I recently made the switch from the marlin-based stock firmware on my anycubic kobra 2, to klipper. I didn't have issues with bed levelling or first layer on the stock firmware, but I'm having significant issues running klipper. The bed is uneven, the probed mesh shows a deviation of 0.197mm, it was the same when running stock FW+octoprint.

But it seemed to be correcting just fine for this on the stock FW. I got a consistent decent first layer across the entire bed.

With klipper, it's absolutely impossible to get it to correct for this unevenness. Half the bed will get perfect first layer, but then the second half is either way too squished or hardly connecting to the bed. And it's causing further issues as it's also hitting the print when moving, despite having Z-hop of 0.3mm for travel moves.

What the hell is going on? How do I fix this?

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[–] [email protected] 2 points 9 months ago (2 children)

If you know your deviation, I assume you have a bed probe, right? Are you using your bed mesh? Can you share your start GCode?

[–] [email protected] 2 points 9 months ago (2 children)

[gcode_macro PRINT_BEGIN] description: Begin printing with nozzle wipe gcode: M300 P500 {% set BED_TEMP = params.BED_TEMP|default(60)|float %} {% set EXTRUDER_TEMP = params.EXTRUDER_TEMP|default(210)|float %} BED_MESH_PROFILE LOAD=default M104 S{EXTRUDER_TEMP} M140 S{BED_TEMP} {% if printer.toolhead.homed_axes != "xyz" %} G28 {% endif %} #BED_TILT_CALIBRATE G1 X80 Y240 Z5.0 F3000 ; position nozzle right next to wipe pad M190 S{BED_TEMP} M109 S{EXTRUDER_TEMP} M300 P500 G4 P50 M300 P500 S1500 G1 Z-0.1 ; lower nozzle before wiping G1 X90 F500 ; wipe nozzle across pad in X direction G1 Y235 F500 ; wipe nozze in Y direction G1 Z3 ; lift nozzle to 3mm G1 X90 Y-3 F6000 ; move nozze to front-left center of bed for purging G1 Z0.28 ; lower nozzle to 0.28mm G1 X120 E25 F200 ; extrude 25mm of filament in a 40mm line G92 E0 ; reset extruder position G1 E-1 F2100 ; quickly retract filament 3mm G1 X135 F10000 ; quickly move away from purge
G92 E0

[–] [email protected] 2 points 9 months ago (1 children)

Could you also post the [bed_mesh] section of printer.cfg?

[–] [email protected] 2 points 9 months ago (1 children)

Sure

[bed_mesh] speed: 150 horizontal_move_z: 5 mesh_min: 25, 17 mesh_max: 220, 200 algorithm: bicubic bicubic_tension: 0.5 probe_count: 6, 6

[–] [email protected] 1 points 9 months ago* (last edited 9 months ago)

What type of probe and what's the config on it?

[probe]
pin: PC14
x_offset: 23
y_offset: 5
#z_offset: 0.10
speed: 20.0
samples: 5 
samples_result: average
sample_retract_dist: 1.0
#samples_tolerance: 0.010
#samples_tolerance_retries: 10

Is what I've got my pinda probe configured with, was playing around with sample tolerances like I have on my printer with a tap probe but I just found the inductive probe has a lot of variation, I added more samples to hopefully average out that error.

[Bed_mesh]
algorithm: bicubic
fade_start: 0.6
fade_end: 10.0
bicubic_tension: 0.2
faulty_region_1_max: 120.0, 74.0 
faulty_region_1_min: 85.0, 45.0 # 103,69
faulty_region_2_max: 125.0, 165
faulty_region_2_min: 70, 110 # 103, 137
horizontal_move_z: 2
mesh_max: 228,210
mesh_min: 24, 6
mesh_pps: 2, 2
probe_count: 5,5
speed: 200

Is my mesh setup, based on a mk3s klipper config. Meshes look a little odd but I ran some bed level prints fine and just ran a full plate of abs with pretty consistent 1st layer.

[–] [email protected] 6 points 9 months ago* (last edited 9 months ago) (1 children)

Looks like you have it set to load the profile "default" instead of "bed60"

Also worth asking, did you have your start gcode set in your slicer previously and if so, did you delete it out of there now that you're using klipper macros?

For me, in Cura, I simply have START_PRINT and END_PRINT in the start/end fields in the Cura settings. Based on your macro title, it would be PRINT_BEGIN and PRINT_END

[–] [email protected] 3 points 9 months ago* (last edited 9 months ago) (1 children)

Yeah forgot that I switched to default again to make sure it wasn't something with the different profiles messing it up. I update the mesh before every print now, once it's reached temp.

I did have my start gcode in the slicer before, but that's been replaced with the macro.

[–] [email protected] 3 points 9 months ago (1 children)

I'll try to check mine when I'm back home later. I just use the default profile since I don't ever adjust anything with the bed unless it's out of spec. Even printing at slightly different temps doesn't seem to affect anything as far as bed leveling is concerned.

[–] [email protected] 1 points 9 months ago

Yeah I'm not seeing any significant deviations in the mesh based on temps either.