Simple Raspberry Pi 3 holder inspired by Gridfinity Raspberry Pi 4 Storage on MakerWorld, I didn't like the empty space and how floppy the Pis fit so I redesigned from scratch in Fusion. Pis now fit nice an snug and I was able to fit 4 in a 2x3 bin. These are Raspberry Pi 3s, I have not tested with other models.
The author marked this model as their own original creation.