My friends own the little shop soet + sister soet in San Diego and requested a two-sided sign. The sign measures approximately 11" x 5.5." ( just under 28 cm x 14 cm).
Here are the files in case anyone would like to print one (or improve upon the design). If you make one, it would be great to see how it comes out!
Directions:
First, run the file with the Closed/Will Be Right Back Panels and Inserts
- Tape/secure material to the bed.
- Draft engrave the blue text.
- Ignore the purple text in the inserts (i.e., 1, 2, 0, 3, Hour, Hours).
- Cut the red lines.
Second, rerun the file with the Closed/Will Be Right Back Panels and Inserts
- Keeping material in place, flip the square inserts with numbers (i.e., 0, 5, 4, 5) and the word “Minutes” over to the right (or left).
- Ignore everything except for the purple text in the inserts (i.e., 1, 2, 0, 3, Hour, Hours), and draft engrave the purple text.
Third, using slightly thicker material, cut the Center Piece.
Finally, glue all 3 pieces together (sans the inserts). I placed a stack of heavy books on the sign while the glue dried (but I think clamps are classier).
Side Note: If you’re good with design software, all elements of the project can be moved to fit on a single piece of 20x12 Proofgrade (the center piece fits easily below the first two panels and the inserts fit into the cutouts in the center piece – note that the inserts are slightly smaller than the cut-outs). If the whole project is cut out of a single piece of material, the inserts won’t slide in and out easily. You’ll need to figure out a way to expand the center piece by just enough so the pieces will slide in and out without getting stuck. If you have any good ideas, I’d love to hear them. 
I just glued in some very thin scrap material that was lying around.
Adding electronics is another wormhole, and I just got into 3D printing recently. 
Too many fun things to dive into.