A parametric flange to fit any size bearing.Note fixed error that causes the edges to curl up when printingI found the bearing at http://www.thingiverse.com/thing:28683 but wanted something more adjustable.Adjust the bearing diameter and thickness to fit your existing hardware. Adjust the belt width to fit your belt. Adjust the tolerance so when it prints on your printer you will be able to fit the bearing inside. Adjust everything else to taste!