[BUG] Skew correction is not applying at all

[Fercik86]

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

I have been trying to get skew correction working on Ender 3. Initially I was running 2.0.9.3 firmware where M852 was showing as M851 I though that might be the issue. After upgrading to latest version skew is still not applying. I am trying to implement it mainly with:

define XY_SKEW_FACTOR

so that it can be changed later. I have no idea what might be causing it to not apply at all.

Bug Timeline

For a long time. In version 2.0.9.3 as well.

Expected behavior

When skew correction is set with M852 I expect some change in the printed part dimensions.

Actual behavior

Skew result is always the same from the test print even with vastly different skew factors.

Steps to Reproduce

Just printing.

Version of Marlin Firmware

2.1.2.2

Printer model

Ender-3 pro

Electronics

BTT SKR V1.3

LCD/Controller

No response

Other add-ons

double Z

Bed Leveling

ABL Bilinear mesh

Your Slicer

Other (explain below)

Host Software

OctoPrint

Don't forget to include

• [X] A ZIP file containing your Configuration.h and Configuration_adv.h.

Additional information & file uploads

configs.zip

[Coizado]

It's working for me, at least the XY, I don't use the ones involving Z.

One must keep in mind that XY_SKEW_FACTOR overrides the measurements, and M852 overrides XY_SKEW_FACTOR, if you never set a value for M852 it will revert to XY_SKEW_FACTOR, but if you set M852 to 0, for example, and save to EEPROM, no matter how much you change XY_SKEW_FACTOR and reflash, it will be set to 0 at startup when the EEPROM values are loaded. EEPROM must be cleared for the value to revert back to XY_SKEW_FACTOR.

I'm on an Ender-3 v1, SKR mini E3 v1.2, latest bugfix, BLtouch clone, Octoprint.

configs.zip

[thisiskeithb]

It's working for me, at least the XY, I don't use the ones involving Z.

It's been a while since I've ran this on my Ender-3 since I ended up fixing the leaning Z gantry issue at a hardware level, but I'd say that the skew correction still works.

Using our Simulator with a basic 25mm cube stretched to max Z height, skew factors work as intended:

XY skew correction with a factor of 0.5 (M852 I0.5):

XZ skew correction with a factor of 0.5 (M852 J0.5):

YZ skew correction with a factor of 1.0 (M852 K1.0):

All skew correction disabled (M852 I0.0 J0.0 K0.0):

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