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I am using Klipper on a modified Wanhao Duplicator i3 (Monoprice Maker Select V2) featuring a BLTouch probe. I am working through the painstaking process of bed leveling, but even though Klipper seems happy with the level, my first layer calibration print using SuperSlicer is not coming out well:

output of calibration print

First, I adjusted the gantry to be level to the table (not the bed). I checked that the PROBE_ACCURACY looks good:

probe accuracy results: maximum 1.995000, minimum 1.987500, range 0.007500, average 1.991250, median 1.991250, standard deviation 0.002016

Then I use the SCREWS_TILT_CALCULATE command to adjust the bed screws until they are very close:

rear left screw : x=50.0, y=200.0, z=1.89750 : adjust CCW 00:02
rear right screw : x=200.0, y=200.0, z=1.89750 : adjust CCW 00:02
front right screw : x=200.0, y=50.0, z=1.89500 : adjust CCW 00:02
front left screw (base) : x=50.0, y=50.0, z=1.87750

The BED_MESH_CALIBRATE command determines that there is maybe a 0.185mm inconsistency across the bed.

BED_MESH_CALIBRATE mesh

I added BED_MESH_PROFILE LOAD=default to my start GCODE, after homing completes.

Then I ran the bed/extrusion test print that SuperSlicer generated for me, shown at the top of the post. The center looks best but the left side is too far and the right side is much too close.

Isn't the mesh supposed to correct for this? What might I still have wrong?

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  • $\begingroup$ Even if my probe's Z offset were wrong, wouldn't the calibration print be consistently bad? $\endgroup$
    – rgov
    Feb 18 at 21:32

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As pointed out by Jake Palmer on the Klipper forum, I needed to apply axis twist compensation.

Some printers may have a small twist in their X rail which can skew the results of a probe attached to the X carriage. This is common in printers with designs like the Prusa MK3, Sovol SV06 etc...

I have Z braces installed but I believe these were poorly set and exacerbating the twist. After fiddling a little while I got dramatically better prints.

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