Hi Agreyson I have had a look at the photographs of your parts, I assume there is a deeper mating part ! I don't of course know the exact largest dimension but I am guessing 8" or 200mm. These would be simple to make with FDM. few months ago we did several very similar boxes - we used ABS-x (ABSpro) and had minimal warping but to be honest If I was given the task again I would probably use PET-g or evem PLA-x3 (PLApro) both made by Mitsubishi Chemical Poly products in Holland and sold by several retailers as own brand products.