I've used the NijaFlex and this stuff is excellent once you get it to print. We have used about 3 rolls so far. I have an Airwolf HD with the Boden head at work. We have found that it sticks to glass easily, little or no bed heat is needed and don't cover the printer leave it open, if the spool material gets too warm it's like trying to push a noodle through the extruder. The parts are extremely tough when printed tight (squish the layers together). The parts can't be torn or pulled apart. We have used them to make flexible pipe couplings, bellows, anti-backflow valves, gaskets and other prototype items for our new products. We have had problems with it jamming in the feed mechanism, it also takes a while to fully purge the ABS from our extruder and for that reason we run it on the hot side (abs temps) so it tends to droll from the tip. Our feeder isn't completely tight on the inside so it can double up inside and jam. Its understandable that using a Boden type extruder is not ideal for a flexible material, but it does work.