This is a new revised version of my original design Bowden extruder. My goal was to enclose the filament path and maintain its alignment as you increase/decrease spring tension or lift it off the extruder gear.
This new rev is more compact, smaller and stiffer. It works awesome!
1 MK7 Extruder Gear
1 M5 thread bowden tube fitting
1 605ZZ bearing (5x14x5mm)
1 bangood bed leveling spring (20mm L, 7.5mm OD)
3 M3 x 8mm button head screw
1 M3 x 10mm button head screw
3 M3 x 15mm button head screws
2 M3 x 20mm button head screw
Drill out the filament path with a sharp 5/64" or 2mm drill bit to ensure the diameter is perfect and to clear any filament that may have drooped into the path. Use very low RPM if you go fast it will get hot, melt the PLA and make a mess.
I have printed this, it all fits and works as designed. See pics above...enjoy!
Assembly Video: https://youtu.be/HxIH7j6g4Mg
Print in PLA.
Do not print in PETG its too flexible.
3 skins and 50% infill makes parts very stout.
Designed with AutoDesk Fusion 360.