Pixel dungeon is one of those games that you need to sink 1-5 hrs into before it starts to get fun. Once you know the basics though it's super fun to play and very addictive.
Oh I agree! I was just thinking about the barrier to entry modifying CAD files. One thing I didn't immediately think of is if you screw up a dimension, you can just print out another to try again...I guess you could argue with the ability to keep improving it over time, the 3D version could have a better fit.
I would guess the 3-D printed version is a lot less durable. Also a lot of the cost of prosthetics is the customisation to the individual, which I'm not sure the printer software could handle.