I designed this mount because i couldn't find one that met my needs: one that is tightened with screws, has a tight grip around the bearing and has four screws connecting it to the bed.
I designed this with a tolerance of 0.1mm around the bearing, which means your extrusion settings have to be dialed in perfectly or you'll have a hard time trying to fit the bearing inside.
When printed correctly, this mount has zero play when trying to move the bearing inside the mount, which is was what i was after :).
Print in the orientation showed in the picture from Simplify3d.
Just snap off the built in supports to clear the holes.