I really liked the DM Screen feasel1 made, but I had a couple minor issues with it. First, I didn't like how big the gaps were between the panels. Second, once it is assembled, there's no taking it apart again because the pins are glued. I've replaced the pins with properly sized screws. Third, the side rails are very hard to attach as-is in the original. I modified those to have an extra surface touching the corner pieces between the two prongs in the original side, top, and bottom rails. The side and bottom rails fit snugly rather than needing to be carefully clamped for gluing.

Please do take a look at the original screen and the video which inspired it.

Note that the interior corners are now different because they overlap. You will want to make sure that corner hinge 1 connects to corner hinge 2 for the top and bottom of your screen during assembly.

The initiative trackers in the picture of the DM screen I use for Curse of Strahd are a slightly resized version of https://www.thingiverse.com/thing:3928239 I can upload a remix of it sized for this screen if people want, but it's fairly simple to make that adjustment.

Planning and Printing

1. Decide how many panels you want the screen to have. Most likely 3-4. You can always add another panel later due to the modular design. The screen is designed to have 2 mm foam sheets (I used 9 x 12 2mm sheets) in the middle layer of each panel. These are not strictly required, as there are also slots for papers on either side of the foam, but it does help when swapping out the papers. It also gives you the option to use it without additional images.
2. For each panel, you'll need top, bottom, and two side rails. Each top rail is actually 3 parts, two side pieces and a middle.
3. Each panel will have four corners, but how the corners are arranged is important. You'll notice there are two versions of each top and bottom corner. Make sure to print one of each type for every hinge you plan to have. For example, for a three panel screen, this would mean two bottom corner hinge #1, two bottom corner hinge #2, two top corner hinge #1, and two top corner hinge #2. You'll also need two bottom and two top corners without hinges. You could just use more hinged pieces for the ends, but that would just use extra plastic.
4. For each hinge, you'll need a screw, a cover, and a nut. I recommend printing these pieces vertically. For a three panel screen, for example, you'll have four hinges.

Assembly

1. Once you've printed the pieces, make sure you match up the hinge pieces. Paired corner pieces should be able to slide together to make a slot for a screw. The screws should be able to go into the slots, and you should be able to thread the nut onto the screw easily using your fingers.
2. To avoid running into issues later, lay out all of the pieces in their final arrangement. This ensures you don't accidentally line up two top or bottom corners of the same number together. You can temporarily assemble the hinges with the screws at this point so that you can see where each hinge piece will go. I don't recommend trying to glue pieces together with the screws in place, however. You'll repeat the following steps for each frame: a. You'll two hinged top corners (or one and a smooth corner for the end), two bottom hinged corners (or one and a smooth corner for the end), two side rails, a bottom rail, two top side rails, and a top middle rail. b. Starting with the bottom corners, glue them to the bottom rail. c. While those are setting, you can start on connecting the top corners. These are a little more complicated because the top rail is three pieces. I found it easiest to lay the corners on top of one of the side rails and lay the other side rail on top of that. Once that is dried, you can put the middle piece flat and the top corners can sit on it to dry. d. If you are inserting foam sheets in the middle, once the pieces from c and d are dry, you can push the foam sheet into the top middle rail and top corners. If the fit is too loose for some reason, you can add some glue. Next, slide the side pieces onto the top, making sure the foam is pushed in to the side pieces. Be sure to glue the side pieces to the top corners as you do this. e. Attach the bottom rail to the side rails and the foam, gluing the corners to the rails.
3. Once all of the frames have dried, you can connect them together with the screws. For storage, the screws can be unscrewed again. I'd recommend storing the screws back in one side of the hinges so they don't disappear.

Please let me know in the comments if any of the above is unclear or if you have questions. Thank you!