Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5347103.

Bearing Slide for Half Height Uni-Strut. This uses 608 bearings on a 3D printed "carriage" that slides nicely in half height uni-strut. I used sheet metal screws to reinforce the bearing axles on the projects I used them for. I printed them in both PETG and PLA with good results. ABS should be good too. the center bearing has a slight spring action to it to allow for tolerance in the uni-strut. The center bearing should obviously be the non-load side.