Aluminum Z Coupling

The first parts to break while operating my Reprap were the Z couplings. It was probably a combination of too much tightening, screwing down the Z motors (experts like PrusaJr seem to recommend taping them), and z rods which weren't exactly level. Epoxy got them back to a functional level, and I promptly printed new Z couplings. And they broke again...

Note: I've heard tons of people say good things about Nophead's Z Coupling design: http://www.thingiverse.com/thing:9622 I haven't tried them, but I wish I had some from the start.

Instead, I purchased Aluminum Z Couplings from an ebay seller named nrg24seven (for a few dollars), and they work flawlessly. Here are a few pictures I took before I installed them: