Linear bearing made of three bearings

thingiverse

UPDATE: Cleaned up some support lines. Added a weight-saving option to cut out some unnecessary components. Fixed errors where supports didn't extend all the way. Added comments to the code. I needed a new linear bearing for my x carriage on my printer. This is my first attempt, and boy, does it work. It's not very parameterized yet, so I'll look into changing that later. Currently, it works with 623 bearings (10mm wide, 4mm wide, 3mm hole in the middle). This design handles lateral force much better than small linear bearings do. The bearing shown in the picture is smooth to move regardless of where you apply the force. Three bearings are held against the rod at equal intervals. The design consists of four parts, with four units combined to form a full carriage. The image shows half of the carriage running on one rail. It's designed for my printer, which is an i3 prusa. So the full carriage rests on two 8mm rails placed 45mm apart. Instructions Print both parts. I used Cura with grid support on everything. Remove the support material; there's a lot in the quarter that holds two bearings. The bearings are secured using 12mm hex cap screws for the side with two, and... others. I should measure those later. The two halves don't meet exactly in the middle. That's by design. The half with the flat surface has slightly larger holes to allow you to thread the screws through. Then they screw into the other half, which has smaller holes. It uses three 623zz bearings internally. Ideally, pad the sides with M3 washers, but it doesn't have to be tight.