Monolith Keychain

This Monolith Keychain is a convenient way to carry around your favourite '2001: A Space Odyssey' artifact of non-human origin. This black cuboid has sides extend in the precise ratio of 1 : 4 : 9 (1² : 2² : 3²). However, this ratio extends past the three known spatial dimensions into the much higher dimensions, like this: 16 : 25 : 36...

The included file 'Monolith Keychain 100 percent' is exactly 10 mm x 30 mm x 90 mm, but is rather large for a keychain.

I recommend printing 'Monolith Ke