Personal experience. What do you think I got out of order? Thin wall aluminum was the most challenging for me, there are minimal visual clues and being such a heat absorbent material blow through happens without warning, very susceptible to warping and distortion and machine setup is very difficult.

When people say they they love a challenge and move ahead when experienced others advise caution, although it sounds cool and brave, frankly it’s silly will result in failure or a huge waist of money and time at the least.