Alternative X & Y Belt Tensioner for Wilson 2 printer

These are the parts to make a better belt tensionner for the Wilson 2 printer.

Original design uses a plastic wheel made of 2 halves with a 624 bearing inside and a M4 screw, I didn't like the idea of the plastic wheel (not perfectly smooth, may not be perfectly round, ...)

Here is a version using 626 bearings and M6 screw, 2 discs prevend the belg to slide, those disks won't cause any firction on the bearing as they push it in the center.

X and Y tensionner design are modified from the