Hi, I had the same problem. Apparently the holes were not drilled to the correct size you can see a thread on it here: You can easily drill the hole...

@chris-annin Just to close the loop on this. After much experimentation I have found that the initial move is incorrect but if I open a different scri...

Ok I have updated the Teensy firmware to 5.0 and using the 5.0 control software and I'm getting the same behavior. It rapidly and erratically rotates ...

@chris-annin Yep I see there is also a new Arduino sketch. Ill update the Teensy to version 5.0 and use version 5 of the software and get back to you.

@chris-annin version 4.4

@chris-annin Thanks Chris.