Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:6226425.

These are supports for the top of the z-axis rods on a Kobra 3D printer. This can be for adding a second rod and/or adding a timing belt along the top. This includes a spot to drop in a bearing for the rod. I used a standard bearing (8mm x 16mm x 5mm).

-- These are printed upside down without supports.