Roller filament guidesPrint, wax the rollers sides, assemble. I jam nut the axle so it stays loose but does not fall off.guide.stl is the vertical guide and is meant to span the top rods on a Prusa Mendel. The guideX.stl is the one that hangs off the side.I made these because my filament is mounted in a milk crate below my machine and guides without rollers were being ground away by the filament.