Out of interest, why not print in PVA then soak it out of the frame afterwards?
How many miles did you cover on Mk1 before it cracked?Don't have a dual head printer, bought a cheap kit some years ago and built a new frame for it. dual extruder is a planned improvment but that will have to wait.
Plus pla is actually quite strong, good elongation till failure.
**Note string and cable ties! missing duct tape though.
Not that many but i cracked it hanging up on some dirt jumps deliberatley abusing it. It road around the peak district fine (up hope brink, potato alley and over to fairhomes)