My original X-ends were splitting, and I didn't like the press-fit style at all.
These work out much, much nicer I think.
Printed in Green PLA, Sliced with KISSlicer @ 33% Infill and .2mm layer height.
I think if I were to print these again, I'd modify the LM8UU holders just slightly so that the bearings are "captured" on both the tops and bottoms. You've got to get the clamp really tight to keep them from sliding around and getting sloppy.