Thing-O-Matic Rod Endcaps with Lip
by countspatula, published
I really liked MacaroniNgineer's endcaps but was having trouble getting the slides out with my fat fingers. I added a lip to make removable easier. I also shrunk the slides slightly to improve the fit and beefed up the corners of the blocks so the screw holes would print a little better.
The slides should fit pretty well, but you might have to sand them a tad.