This is an experimental 3d printable rotary rolamite bearing. Being experimental it hasn't been printed or tested yet. It is based on the design found here(SEE FIGURE 16): http://www.rexresearch.com/wilkes/1wilkes.htm
If you print this out please give me feedback on how well it works or if you're feeling really generous send one to me...
What you need: RTV sealant grade silicone(though should work with other types of silicone too.), a short length of M8 studding(optional), some M8 bolts(optional).
Step 1: print all parts, print six of the parts named rolamite_roller_print_six.stl, and one of every other part.
Step 2: Mold the flexible silicone band. Fill the channel in the part named rolamite_band_mold1.stl with silicone, be careful not to create any bubbles in the silicone when you do this. Next either scrape the excess silicone off the top with the back of a knife as you would when measuring out a cup of flour, or put rolamite_band_mold2.stl onto it and apply pressure. One way of doing this is to put M8 studding through the hole in the molds, put two nuts on the end of it, and tighten. Or you could use clamps or something heavy.
Step 4: After the silicone has finished curing, carefully remove the flexible silicone band from the mold by going around the edges with a toothpick. Trim excess silicone.
Step 5: assemble parts according to picture.