Hi all,
I’m looking into swapping the U1’s two XY steppers for 0.9° motors to further reduce VFAs, following up on the ideas from the “Eliminate VFA on the Snapmaker U1 (for free)” thread. I’m already running the Extended Firmware, so the Klipper side is straightforward (full_steps_per_rotation: 400 in [stepper_x]/[stepper_y], then re-run vibration compensation). The open questions are purely mechanical/electrical, since Snapmaker doesn’t publish motor specs and the XY motor isn’t available as a spare part in the store yet:
- Stock XY motor specs: frame size, body length, shaft diameter and length, rated current — or ideally a photo of the label with the model number.
- Pulley: removable via grub screw, or press-fitted onto the shaft?
- Motor-side connector: which type, and is the pinout documented anywhere?
- Clearance: is there room behind the inner panels for a 48 mm body (e.g. LDO-42STH48-2004MAH, the usual 0.9° CoreXY choice)? The wiki replacement guide mentions the motor can be blocked by the inner panel during removal, so I suspect it’s tight.
If nobody has done this yet, I’m willing to be the first: I’d pull one motor, measure and photograph everything, and document the full swap (including TMC2240 current settings and before/after VFA test prints) in this thread.
Any data points, teardown photos or measurements would be much appreciated. Thanks!