I made a 3D printed 10" mini rack. Its 6U tall and uses M5 bolts that screw directly into the plastic.

It can be printed on any standart sized printer.

Assembly is simple, just glue it together. The upper and lower beams can be alligned with the little alignement pins.

I added some feet which can be printed out of TPU.

It also features 3.5mm slots for a 3mm acrylic sheet to be slit in. Just make sure to slide it in before you glue in the upper SideStretchers.

Suggested dimensions for the side panels would be 285mm * 150mm.

Feel free to suggest improvements :D