Problems with Marlin build for Bigtreetech SKR mini e3 on an Ender 3 Max

Hi,

I've recently installed a Bigtreetech SKR mini V3.0 in an Ender 3 Max with the TFT35 screen.

Everything is running perfectly, things are connecting and it's mostly working as it should...

That is except for one major issue, which I believe is with microsteps or the TMC drivers where it appears to be underextruding (Despite mA settings) affecting infill and print quality.

I'm just printing XYZ testing cubes at the moment however this is extremely visible while printing (Underextruded infill) as well as on the top of the XYZ cube where the print surface looks jagged compared to the smooth XYZ cube I had with the previous 4.2.2 board installed.

Here are some pictures of what I mean (It's apparent while printing with missed layers in the infill and on the top with jagged surfaces etc compared to a smooth top Z layer)

[postimg.cc]

The one on the left is from the 4.2.2 board and the one on the right is from the BTT board

(The XYZ printed by the 4.2.2 is also a bit heavier than the BTT's XYZ leading me to believe it's missing material)

I'm at a loss after compiling firmware after firmware for the board as to what's causing this, if anyone could help I would appreciate it very much

I'm happy to upload my configuration.h and configuration.adv.h and a changelog for all the changes I made from the stock Ender 3 Max configs while compiling the firmware.

Thanks

Edited 2 time(s). Last edit at 01/15/2026 10:33PM by illici7.