I've run just about everything there is on my Up and Afinia. The Zortrax is on an ABS-only diet for the moment, and so far the gMax has only run Colorfabb PLA+PHA. I'll probably try it with Ninjaflex soon - the 0.5mm nozzle and controllable speed will be good for it, but it remains to be seen how the feeder will do; slippage is a problem with the Up and rubber. Also looking forward to trying nylon on the gMax. I have a bunch of XT but support removal has been difficult on things I've printed with it. I couldn't get T-Glase to feed on the Up but it probably will on the gMax. And I've got a spool of Woodfill... so many things to try!