Infinity Mirror Cube
thingiverse
This was designed in Fusion 360 and printed on an Ender 3 Pro. I've included the f3d file so that you can edit if you like. I'd recommend doing so to make sure the side lengths are close to a multiple of the individual LED segment lengths in your strips to make soldering and assembly easier.
Download Model from thingiverse
With this file you will be able to print Infinity Mirror Cube with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Infinity Mirror Cube.