I designed this support because the one I previously used generated a lot of friction that even eroded it, so I added a pulley! It's designed for the Mendel Prusa I3 metal frame, 6,2 mm thick. I hope you like it!Just print and assembly. The holes has a 3mm diameter. You can use screws or even a piece of 3mm filament adjusting a little bit the hole of the pulley, so you can leave off the metal at all.