I am a retired scientist/engineer. Built a Velleman K200 printer in 2016 which I used for many years about 1500 prints. Bought a Prusa Mk3 kit early 2018 and am now almost ready to install the MMU2S upgrade, some issues remain.
I make most of the models I print using Blender. Some from internet particularly thingiverse and Prusa models - many modified