Raspberry Pi Super Computer STL Files Published on Thingiverse

Finally. I'm sorry it took so long. Here it is, the files to print your very own 2U rack mountable Raspberry Pi holder for 21 Raspberry Pi 3B+. Let me know if you have any questions or problems. Just because we made over 50 of these, doesn't mean it's easy.

https://www.thingiverse.com/thing:3958586