My professor always has a Lego figure on his keys and you get bonus points on exams if you can remember the ones he's brought to class over the semester. I wanted to give him something neat to add to his keys as a thank you and thought I'd share what I put together for any other Lego lovers. I had to do some testing to find a brick design that was easy to print and designed the 2x2 that securely holds the keychain as the other 2x2's I tried all were too loose. I chose to remix because I'm terrible at 3D design and both the original creators had already produced an ideal design for my needs so major props to them for their designs, thank you.

Original .stl files are:

https://www.thingiverse.com/thing:5020390

and

https://www.printables.com/model/930192-keychain-lego-brickstl/files