Good point about .5mm nozzles maybe not clogging as much. Would be a good option for lower-res prints that take a long time to print.

The MK-1 (Mark One) prints with 1.75mm filament at up to 260°C; this includes ABS, HIPS, PET, PLA, PVA, Nylon (Taulman 618), Ninjaflex, Plastink Rubber, T-Glase, LayWoo-d3, LayBrick, BendLay.
Aren't the low-temp materials (such as ninja) mutually exclusive of the high-temp ones (PET) ? My understanding was that the low-temp ones needed a PTFE heat barrier to reduce heat creep, but the high-temp ones want the creep so as to pre-heat the filament.