The file 'NEMA Motor Rotation Indicator 3D Printer Model' is (stl) file type, size is 14.9KB.
This is inspired by, but not derived from, the indicators here: https://www.thingiverse.com/thing:2638857
Uses a 1/4" x 1/8" round magnet ($0.90 each as of posting) from McMaster-Carr: https://www.mcmaster.com/5862K103/
The magnet press fits into the sleeve, and on many steppers should fit fairly loose in the end hole (made on and works with Prusa motors, tested on a couple others I have around)
Motor_Spinner.stl | 66.7KB |