This is a corner riser to elevate your Power Macintosh G4 Cube by one inch. You'll want to print four, one for each corner.

The G4 Cube is convection-cooled, but normally only takes in air at the back. Raising it with these corner risers means you get air intake at all four sides.

The extra vertical space underneath also makes the ports and programmer's switch on the bottom of the computer easier to access without having to turn the computer over.

I wrote the model in OpenSCAD (model source attached), sliced it in Simplify3D, and printed it on a PowerSpec Pro printer in PLA.