Nerf Modulus 180 motor cover

Remix of the modulus motor cover by yes_im_from_Texas_Nerf.

Reduced it to solely the motor cover (use original rail), reduced profile, altered angles on face, removed wording, added holes.

Tested using reprap prusa i3 geeetech, so resolution/dimensions may vary.

EDIT: While calibrating my printer, I noticed that my x and y axis dimensions might've previously been a little off, it's possible that this item needs to be scaled up by approx 1%.