Summary This variation of my other Slew-Bearing has spacer-elements between the rolls. Rolls have a conic shape. The Fusion 360 model has parameters for the spacer size, and the gap between roll and spacer. In particular the control over that gap helps to tune the design for a perfect distribution of the rolls across the track. The outer trace is horizontally split into two halves. My earlier design has the problem, that it is difficult to control the gap between roll and track, and the gap between two neighbouring rolls, because it's only a single parameter. Another problem is the control over the bearing diameter, which depends on the number of rolls and their diameter. The STL-files attached to this project is a bearing with 12 rolls (8 mm diameter at the center), and 2 mm spacers. The spacers are split in an lower and an upper part for better 3d-printability. Their shape is identical - nevertheless I've exported them separately. Related video (tutorial with cylinder rolls): https://youtu.be/5o4Fj8OxkB8 Print Settings Printer Brand: Ultimaker Printer: Ultimaker 2 Rafts: No Supports: No Resolution: 0.1 Infill: 35 Notes: 0.15 mm layer works as well