cartreader/case

Print settings for Slic3r Prusa Edition

Select the "0.20mm NORMAL" setting that comes with Slic3r and change the following parameters:
ensure_vertical_shell_thickness = 0
fill_density = 5%
first_layer_height = 0.3
perimeters = 1
thin_walls = 1

Print settings for Cura 4.x

You can use the Draft 0.2mm profile but you might want to change the build plate adhesion settings since the default seems a bit too much.
For the N64 sleeve you need to enable the special mode "Spiralize outer Contour" or else the walls will be too thick.

Combined STL file with all parts

Separate STL files for each part

snes_spacer.stl is a small 3d printed spacer to relieve pressure from the pins of SNES clone console slot

n64sleeve.stl helps with aligning N64 cartridges

backplate_simple.stl is the backplate that holds the Arduino

microsd_spacer holds the RGB led and fits between the micro SD card and the Cart Reader pcb (print with clear PLA)

sidewall_tabs.stl secures the Arduino Mega to the backplate with five M2x8 screws

case_xxx.stl are a replacement for the more simple backplate in case you prefer a full enclosure

The rest of the STL files are alternative designs in case you use the battery add-on.