Bowden Tube Filament Guide
thingiverse
A pivoting bowden tube filament guide mounts to whatever you like with two M3 screws, making it easy to install on aluminum extrusions or a printed mount adapter. The 1.75mm guide requires a 4mm outer diameter bowden tube and the 3mm guide demands a 6mm tube. Simply print the guide, insert a ptfe tube (or omit it if you prefer), and secure it in place with bolts. The tube fit is snugly tight to prevent it from pulling through during use. I only achieved about 3mm insertion into mine before deciding not to proceed further, but that's perfectly fine. This bowden tube filament guide has been tested on a Prusa i3 Mk3 & Mk2S and performs smoothly without kinks even when the extruder is at the top of the Z axis.
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