This print is a bit more complex than my usual ones, and several parts need specific settings, these are the ones I've found that work the best.

Door: 1.mm layers, 2 perimeters, 5% infill, and 6 bottom and 9 top layers.
This is so it can flex in to place easily. PLA worked for me, but plastics like PETG, Nylong and ABS which have more tensile strength may be better.

Shell: .2mm layers, 3 perimeters, 10-15% infill and 8 bottom and 4 top layers. Use a 6mm brim as well to help it stay on the build plate.
Since screws are being driven in to serveral places where there's support material, more bottom layers help, as well as more perimeters. Aternately, the use of a M3 tap lets you get away with less solid layers.

How to place in the door correctly.

The door has two nubs and a negative spaces to accept them both. Start by placing one of the nubs on the door in to the shell while holding the door 90 degrees to the shell. I've found that it's easier if you place it in the negative space on the side that's thinner. Next, gently bend the door at the centre and swing the other nub in to place. There may be a bit of friction, but it will pop in. If you're experiencing troubles, don't force it, you can always scale the door down in one direction and reprint. If you're finding you're having a lot of issues with something like PLA, try PETG instead, it has more tensile strength and it's a bit more flexible , which is just about perfect for this!