Filament Guide for the CTC Prusa i3 Pro B

thingiverse

This is mainly to stop the filament from carving a groove into the top of the 3D printed spring-loaded extruder, which you should have already printed as it under-extrudes without it. Even if it's printed in ABS (which mine is), it will still wear out where the filament enters. It works with a 695 bearing, not to be confused with a 608, which can be found inside some fidget spinners: https://media.licdn.com/mpr/mpr/AAEAAQAAAAAAAAyqAAAAJDMyMmY5ODM2LWQ4MTEtNDRkNy1hZWE5LWUzOTQ2NTliYTU0NQ.jpg This is compatible with the CTC Prusa i3 Pro B fan duct by Jon1h. I took the V-grooved wheel from a random spool holder and resized it. Pin 1, Pin 3, ctc_fan_duct_clip_1, v_groove_wheel, and base STL files are all printed once, but Pin 2 is printed twice. Assembly goes like this: clip the CTC Prusa i3 Pro B fan duct clip to the back of the extruder as shown on the [CTC Prusa i3 Pro B fan duct by Jon1h](https://www.thingiverse.com/thing:2415652) thing page. Slot the base into the top part. Insert the 695 bearing into the V-groove wheel (you may need to use a hammer). The assembly of the wheel itself goes like this: Pin3 {} Pin2 V_groove_wheel_and_695_bearing Pin2 {} Pin1.