An OpenScad script for producing a cartridge shell for Intellivision,

STL file is included.

Use the default settings for generating a working shell.

All parameters of the design may be modified using sliders and buttons.
However, any width or depth modification will make the shell too large to fit. So avoid altering those settings.

Cart length can be modified as well as the circuit board thickness.

On my printers (an Ender 3) and a Aquila clone (prints better than the Ender) the shell halves clip together nicely with a little bit of pressure.

Pin spacing is trade off between cart compatibility and strength so the pin radius may need to be tweaked for your printer.