My wife wanted to do an escape room fundraiser & my daughter found plans to make a cryptex. I was too lazy to use PVC, screws, hole saws, and wood, so I designed one for the 3D printer. My printer was printing a bit "large" so I added more clearance than it really needs so that I wouldn't have to sand it as much. I also designed it to not require support material. It's pretty simple. Just keep adding as many rings, locks, and inserts as you want letters, and you should be good to go. Don't let the three lobes fool you into thinking there are multiple solutions. They're unevenly spaced and only go together one way. I used a glue stick to put the letters on, but this made the paper stretch a bit, so I made the strips of letters smaller to compensate.