Mechanical Arm

So this is a mechanical arm I 3D printed for the Halloween of 2018. The bracers, upper arm, and pauldron will likely only fit me because it was custom designed, but it's a good place to start if you're interested in 3D printing the parts.

Skulls from: https://www.thingiverse.com/thing:2396869
Adeptus Mechanicus Emblem from:
https://www.thingiverse.com/thing:1098997

Printed each part separately, then sanded down to fit. Tolerance not included for the lower piston, print at 95% scaled in x and y directions, assuming you are printing the part vertically
Also, I had a significant amount of difficulty with the gears(nuts shaped like gears), fitting to the bracers/ upper arm, so I scaled them to 105% when printing. I suggest doing this, though if your printer has more precision than an Ender 3 on 0.1 mm layer height, feel free to try printing at 100%, though I'm not sure it'll have enough tolerance :)

Key for the hand:
B- base, basically the back of your hand
T- thumb
p- pink