This case will secure the Famicom to NES adapter that can be found in some US NES cartridges. It provides room to connect a Japanese Famicom game at the top for play in a NES console.This was specifically designed for and printed with a .35mm hotend tip. Wall thicknesses are optimized for this sized tip / extrusion width. A .40 might work, but a .50 will most likely not. I have not tried either. I sliced at .18 layers, 2 perimeters, and used 90% infill. You will need (4) self-tapping screws for assembly. I re-purposed some old laptop case screws (2.5mm)