We were building the tables on this instructable (httpwwwinstructablescomidThe74PVCMegaAwesomeSuperPVCTable) but didn't find the pvc caps that attach to the tables at any hardware stores. We decided that rather than order them we would put our 3d printer to good use and design the part. V1.2 has a decreased height, fixed support, and enlarged holes for screw heads.

Attribution - Creative Commons

Digilent