Should work with typical skate bearings/608zz or any bearing that is 22mm outer diameter and the right inner diameter for your threaded rod or leadscrew.
Redid this because the original design has the parts made of separate objects all placed within eachother and attached, but not one solid mesh. My slicer does not like that much at all. Was basically printing gaps between each part of it, making the model mostly useless to me. Completely re-modeled it as a single solid mesh, reinforced it a bit while I was at it. Original design by saschai. If you're having trouble with his/hers, try mine. Should work fine.
May further revise for additional stability later, but this is what I have for now.
Im printing it at about 20%, go harder to go harder.