I had Australian heat kill my first MPCNC (printed in cheap PLA) so I re-printed in a combination of Taulman Tech-G and N-vent.
Huge improvement in rigidity/stiffness, and no cracking /deformation so far with several hrs of aggressive use.
I’m just about to do some testing on using it as a printer. I’m going to experiment with how far I can push the speeds and acceleration before inaccuracies become apparent. Will be interesting.