Prime Monolith Set

This is my first contribution here. It is a 2001-style prime monolith set. It is 2001-style because the monoliths’ dimensions are 1:4:9, the squares of the first three positive integers, just like the monoliths in 2001 A Space Odyssey.

The monoliths are prime because their depths in millimeters are prime numbers, namely 5 mm, 7 mm, and 11 mm. There are three of them, which is a prime number as well.

I do not own a 3D printer and I did not use any design software to create them, just pure mathematics. Unfortunately, that means I cannot test whether I created the right STL file (especially, I am not absolutely sure I am using the x-, y-, and z-axes correctly). If you print it, please mention it in a comment, so I know I did it right. And if you cannot print it, mention that as well, so I know I need to fix it.

Have fun!