Initiative trackers for Dungeons and Dragons, or any other table top game where you need to track the turn order of players. The trackers open up so you can quickly swap the card (35x50mm portrait) inside. Shown in this video... https://youtu.be/39_0oxFo7TI
The tracker is designed to be placed along the top of the DM screen, however, a rack has been provided if that suits your needs. https://imgur.com/a/SKjdT8i
To print the tracker, use InitTracker35x50_g#.stl, where # is 1, 2 or 3. The 1, 2, 3 represents a 0.1, 0.2 or 0.3mm gap between the hinges. Which one to choose depends on how your printer is calibrated. Try 2 first. If 2 is too tight, try 3. Too loose, try 1. If that is not enough, let me know.
If you don't want to use your DM screen, then print the rack. There are three different lengths, InitTrack2 to InitTrack4. Choose the largest for your printer. Print as many as you want to support as many players as you need. You'll also need to print 2x InitTrackSupport.stl per InitTrack. They slide on and help stand it up.
Idea for DM:
You can place a different picture on each side of the tracker. One could be a silhouette of the creature with ??? as the title. The other could be a full colour picture with the actual name. You position the silhouette outwards towards the players until they identify their foe. Then you turn it around to reveal the details.