15.9mm mounting for push to fit self align bearings there's a couple 4mm holes for attaching this to platform or what ever you want to use (30.9mm distance between the center of the holes)I'm going to use this to mount platform to mendelmax, but you could use it to mount what ever you want.I'll post pictures when I get this done.There are two models, the difference is rounded corners in V2Just print it and push the bearings in. I recommend rotating it before printing.If you need a same mount for Igus bushings get this: http://www.thingiverse.com/thing:14593