I have recently got a 3D printer and am learning to design stuff to print, here you will find all those things.
I designed this cart storage module for my limited cart collection, it's handy for sitting next to my computer when playing. I sized the holes just big enough to fit the AVG cart so it will hopefully also fit SIDE 2&3.
A couple of small PCB's that interface Arcade Joysticks and up to three Fire buttons + two pinball flippers to the Atari 8-bit and VCS
A case for the MIDIMATE compatible SIO2MIDI from Mytek
I felt there was room for improvement in the cases available for the SDrive-MAX, so I used it as an opportunity to learn TinkerCAD, Cura, OctoPrint and 3D Printing.
I designed a couple of cases that look like standard Atari carts but they fit the Ultimate Cart PCB.