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 might end up too thick.

Combined STL file with all parts

combined.stl has all the needed parts combined into one STL file in case you use a 3D print service that calculates by volume.

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

Full enclosure addon

The case_xxx.stl files are a replacement for backplate_simple.stl in case you prefer a full enclosure, you will still need the other stls though.

Battery addon

The xxx_battery.stl files are alternative designs in case you use the battery add-on and replace the similary named default stls.