Splined Idler Pully for Mini Kossel

I already had some 623 bearings left over from another project so I wanted to use them here instead of buying F623 for the Mini Kossel (MK) I am assembling. The splined design allows a crisp shoulder to be printed with no overhang issues and a symmetrical design.

The printed texture of the spline and wheels create a grip surprisingly strong. Requires a well tuned printer.