I started experimenting with building my own custom boxes out of uhaul cardboard to ship stuff on eBay. Here is an 18”x13”x5” made using the pass through slot. Using a score setting at 500 speed, 30 power, 0.15” focus, you can score the cardboard just enough to bend the corners and the flaps. For a smaller 10.5”x8.5”x7” I built it in 2 pieces with an extra 2” flap on one end of each piece to hot glue together. For this larger one I built it in 4 pieces with a 2 inch flap on one end of each to glue together. After drafting it once, it’s fairly fast to cut and assemble.
This is what the files look like. I used an art board close to the size of a sheet of cardboard that fits within camera view and still has enough clearance to use honeycomb pins to secure the piece. I design my boxes to fit within that window.