A simple side brace/end cap for the RepRak storage shelf.  I printed this in PLA and the caps are quite tight over a ½" conduit tube.  You will need to lightly heat up and soften the caps to friction fit them over the conduit ends. I imagine printing this in TPU would also make a good friction fit without the need to heat the part but I haven't tested this out.  

Printed in PLA with a .4 nozzle, no supports needed.