I’ve built a Lowrider II and used the SKR v1.3 with TMC2209 drivers. I had to make my own version of Dual Endstop with Marlin in order to have the latest Marlin to be able to use the TMC2209, as the Dual Endstop firmware from V1 or Teaching Tech did not have the Marlin version that supported them. Otherwise I have all the same components as on the list of parts that V1 specify. Belt, teeth and lead screw spec wise.
The problem I am having is that the Y2 stepper motor is being made to go about 4x the speed as the Y1.
I’ve been playing around a lot with the Default Steps Per Unit and although this does vary the speed as it should, the ratio is still about 4:1. 4turns of Y2 to every 1turn of Y1!?
I must be missing something obvious in the firmware here. It’s not a hardware issue as I swapped the plugs around on the board and the problem is replicated on the other motor.