Here is a case I've designed for a pal of mine with heavy inspiration from the following model:

https://www.printables.com/model/359694-nintendo-switch-horizontal-game-stand

The stand features 4mm walls all around and accommodates 10 Nintendo Switch game cases at a 2.5-degree angle each. It features 15mm OD round indentations for round feet (store-bought silicone variety or printed in TPU - model included).

Hope you find this thing useful. Happy gaming!


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UPD: Fear not if some of your cartridges have no cases. For now, there is a solution.