I really liked the design from The_Craft_Dude and decided to modify it for Switch carts.
I also decided to add a very simple latch to the design so that the case stays shut. After printing I realised/decided it also needs a small cut out to for easier opening.
I have added both versions to the files so you can mix and match between them.
On my printer I needed to use a raft and supports due to having to print the piece standing on its edge.
The hinges are held together with a small piece (1-2cm) of 1.75mm filament. You may need to use a drill to open up the holes in the hinges and a spot of glue to keep the filament in place.