Laser on round objects.
The wheel outside circumstance should be 4 times the size the travel you get on one rotation for the axis you are replacing.
Example. If y axis moves 10mm every motor rotation. Then you Drive wheel need to be 40mm circumstance. c/3.14=D diameter would be 12.7388
Used 608 bearings. and one nema 17. Just wire in in replace of you axis. I replaced yaxis.
I have slot wall on my bed witch makes aligning really easy. Just like the picture