Prusa I3 wood frame filament guide
After fighting with several other filament guides I decided to make one for the wood frame version of the Prusa I3. The problem with all the other guides I have seen is that they all cause the filament to slide over a hard point and that causes noise and wear. So enter the pulley guide.
I printed mine at 0.2 layer height and 190 Celsius, with PLA.
After two weeks with it at 100% scale, I reprinted at 200%. It is much smoother, and holds the filament better at the larger size. Just a tip!