I've had the Ninjaflex filament for awhile but the old acrylic extruder didn't keep the filament straight enough for me to even push any length of it out.

I'm using the bowden version of the E3D head, I'm not sure if they actually differ in regards to that but just in case. With the Mk5 and open end of the E3D it was actually worse feeding in, so I just stuck in a small section of the PTFE that came with the new hotend. Don't mind the gap in the bottom of the Mk5 , my octave green gained some moisture and I can see stress marks in the filament from the end of the roll .





This is right after I printed the 0.5mm single wall test, you can see how flexible it is there.



I tried to break/tear it but it holds its own, even with just 1 wall thick. I couldn't tear the layers apart either, they just stretch.





This thing is ssllooww going right now, I went ahead and started it at just 10mm/s. I'll try later to see what speeds are attainable. She is singing a different tune at this pace. The tire I have from Thingiverse is supposed to take over 2 hours, but I'm going to stop it quite a bit before then I think. It has a few more walls and should be usable on the wheel that is also in the pack.

Bowden SD3, Rumba, E3D hotend, Mk5 with RtRyder changes, Direct drive Y axis and bearings, GT2 pulleys and braided fishing line, Lawsy linear bearing conversion, M3 Z screw.