Print the appropriate files named "[region]_Display_Bottom" for the cartridges you want to display.
Then for each additional cart, you can print the files named "[region]_Extension_Cartpiece", and simply screw them on the previous one(s).
You won't need to print supports for every cartpiece, but I highly suggest doing it every other 2 to 3 pieces.
You can find "Extension_SupportConnector_25mm" and "Extension_SupportConnector_50mm", and they are meant to create whichever height you require, simply by screwing them together.
(note, depending on how tall people go with this, I may add more height variants in the future - just send me a message if you are in need of this!)
If you go in height too far, and notice the support structures become too "wobbly", you can print the "Extension_BaseConnector" pieces.
These slide into the holes for the support structures linking them together and stopping sideway movement.
Required to connect cart pieces together:
2x M3 * 15/20mm
2x M3 square nut
Required to connect support connectors together:
2x M3 * 5/8mm
2x M3 square nut
(one for each side)
These are all the other variants available:
Atari 2600: [Printables Link]
Atari 7800: [Printables Link]
SEGA Master System: [Printables Link]
SEGA MegaDrive/Genesis: [Printables Link]
Nintendo 64: [Printables Link]
Super Nintendo/Famicom: [Printables Link]
The author hasn't provided the model origin yet.