Print any one of the Frame designs and mount it with ordinary wood screws to a wall. Then either edit the corresponding Insert design and add 3D text and print that, or just print one and apply text or images via paint, labels, etc. The resulting insert should slide into the frame easily to serve as a sign you can easily change out. Vacant/Occupied, maybe? Or the name of your assistant, so you can fire him and hire a new one every week? I plan to use it for my recycling center, to show which thing goes where, but find your own use. There are three variations, all in the same form factor. Open is a simple plaque that slides either direction. End is just like Open, but has a stop at one end, so when you slide it in from the left, it'll go just so far and stop. Split divides the frame to hold two smaller plaques, great for having one of them show what's above and the other what's below. I also includes a Split which already has an arrow. (If it's not facing the direction you want, rotate the entire object before adding text!) The pictures show an insert modified with text and an arrow that's included in the remix you can find linked from this thing.Print the frame you want, and one or two of the plaques, after remixing to add letters (or just paint them on later or stick on labels). These should all print fine without any supports, though you might want a brim to avoid curling. Mount the frame with #6-32 flat-head wood or metal screws, then slide the insert(s) into it as desired.