Pyrigan & Company
For the most part, I design and make high tolerance mechanical puzzles in aluminum, brass, and steel. You can read about them on my website (https://pyrigan.com). But I also enjoy solving other people's puzzles and when I find one that I think will come out reasonably well when 3D printed, I create an .STL file and try it out. If it's a success and the designer gives me permission, I'll add the puzzle here.