Just wanted to share a little tip I happened upon on over at matterhackers. It isn’t a replacement for the convenience of a flexystruder, but it does allow fairly sucessful ninjaflex printing with a standard TAZ 5 extruder. I tried it. It is hard to get the bit of tube cut precisely - it needs to be as long as possible without interfering with the idler or hobbed bolt - but once you get it cut properly, it works. I’m not getting kinks in the ninjaflex anymore!
https://forums.matterhackers.com/topic/11/quick-hack-for-printing-ninjaflex