extruder flex filament / tapered thead coupling mashup

thingiverse

This is a modified extruder for printing flexible filament. It also has a built in coupling so you no longer have to use the unreliable push fit couplings. I take no credit for this thing. All I did was mash two other peoples hard work into one part. You need supports for the coupling part of the extruder. Added a new version with serrations on the inside of the coupling to help stop the teflon tube from slipping out of the coupling. Haven't tested if this actually works, and it makes the coupling weaker, but I think as it's a compression joint it should be ok. I also printed the serrated version in ABS for added strength. An alternative is to use the non serrated model, and then screw an m4 bolt into the coupling to add a thread to the inside.