A:Answer PLA and PETG are ideal in the current configuration, PVA is a horrible filament that soaks moisture like crazy, is only used for support and clogged two of my nozzles despite being dried for 10 hours. TPU is tough to print with, but it is possible as is ABS.
If you want to print with better materials, get a Hardened Steel Extruder and Gears, then upgrade the machine.