Based on thing:337267, with following changes:
- Split into upper and lower part to simplify print and assembly.
- Upper part has been reinforced
- Lower part now is inserted into hot-end instead of being attached to extruder tension arm.
Have some hours of printing with Ninjaflex during December 2014, working OK.
Does not obstruct when printing PLA. Actually makes it a little bit easier to thread new filament.
- You may need to extend the holes in upper part a little bit to avoid upper filament support conflicting with hobbled knob
Printed at 100% fill.
Recommented is to print ninjaflex-support-lower-tube for the lower part. It is simpler and more reliable than previous design. It can be tricky to print right because being so small, you may need to try a couple of prints to get it right.
In Cura on my machine I needed to scale to 1.05 for it to create the toolpaths, and use fill = 50% to get the right dimensions.