uGen: How did you machine the UHMWPE, just sawing and drilling? Did you do anything special to smooth out the walls of the bearing holes? From your links to Technoplast Kunststoffe and ebay.de i guess that you are from Germany. About sourcing sheets of oil filled nylon: Kern GmbH Der Kunststoffladen ebay I ordered a sheet of oil filled nylon from ebay and will try to make some bearings out of iby Marshall Banana - Developers