Tried Semiflex (in black) from Ninjaflex. Couldn't even get it to extrude from the nozzle during the load process... The mod-T is capped at 220 c which is a bit below the recommended temperature for semiflex, but within the temp range, dunno how hot it gets during loading so don't know if that's the issue here or something else. Has anyone else had success with semiflex or any other flexible material? As per a suggestion from Curious Aardvark I'll probably get some polyflex next

Also tried RepRapper Tech Purple to Pink thermochanging PLA. I've made loads of little mood rings, prints very well, used same settings as with the new matter PLA