Hello! I have BTT SKR Mini E3 v2 board with Marlin 2.1.2 The board is new, I did some testing with it but other than that it is new. I dont think I have toasted it with anything but never know 8-) Issue is the following: Once uploading firmware the Y motor runs exactly 1/8th of the speed. The setup is coreXY so this should not happen. Both motors should spin same speed when movement is orthogonal. The things that I tried so far: Swapping motors. Motors are OK Changing steps/mm value in firmware, however in corexy configuration marlin does not allow you to have different steps/mm for the motors, they will run one speed x dir then other speed y dir. It was my first idea to just multiply the steps with 8. microstepping is 16 for both motors I have tried changing the pins of Y to Z in the pins file, the issue is the exact same hence I'm suspecting it is software related not hardware Issue is same if I comment out the corexy setting in marlin Here is a video of the problem in action, as you will see the setup is extremely minimal, only the motors are connected to the board: https://drive.google.com/file/d/1Z0V02q8_YKEnI5gHkSghmK6WUER_wdlu/view?usp=sharing here are my config files: https://pastebin.com/pebDtujY https://pastebin.com/Rq7LD3va I want to know what do you think, is my board faulty or is it some software issue I'm overlooking.:S https://reprap.org/forum/read.php?13,892431,892431#msg-892431 Tue, 14 Apr 2026 02:12:47 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?13,892431,892431#msg-892431 https://reprap.org/forum/read.php?13,892431,892431#msg-892431 I have BTT SKR Mini E3 v2 board with Marlin 2.1.2
The board is new, I did some testing with it but other than that it is new. I dont think I have toasted it with anything but never know 8-)
Issue is the following:
Once uploading firmware the Y motor runs exactly 1/8th of the speed. The setup is coreXY so this should not happen. Both motors should spin same speed when movement is orthogonal.
The things that I tried so far:

• Swapping motors. Motors are OK
• Changing steps/mm value in firmware, however in corexy configuration marlin does not allow you to have different steps/mm for the motors, they will run one speed x dir then other speed y dir. It was my first idea to just multiply the steps with 8.
• microstepping is 16 for both motors
• I have tried changing the pins of Y to Z in the pins file, the issue is the exact same hence I'm suspecting it is software related not hardware
• Issue is same if I comment out the corexy setting in marlin

Here is a video of the problem in action, as you will see the setup is extremely minimal, only the motors are connected to the board: https://drive.google.com/file/d/1Z0V02q8_YKEnI5gHkSghmK6WUER_wdlu/view?usp=sharing

here are my config files:
https://pastebin.com/pebDtujY
https://pastebin.com/Rq7LD3va

I want to know what do you think, is my board faulty or is it some software issue I'm overlooking.:S]]> daninet Controllers Wed, 05 Apr 2023 10:45:51 -0400