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. Normal carts obviously fit fine as well.
The back has a matching angle to the front so it should be modular although I didn’t take any particular steps to be interlocking.
From the photos you can see the infill lines showing through, this is because I made the walls only 0.8mm thick, making them greater than 1mm would clean that up.