The right tools for the job
My Kickstarter puzzles all need to be dyed and oiled before I can put the final assembly together. Obviously they can't be stacked up while they're drying so making a drying rack to store all the sheets without touching each other seemed to be a sensible idea. The whole thing was coated with some spray lacquer to stop the burnt edges of the rack marking the sheets. The whole thing works just as intended.
Another tool for the job was made without going anywhere near the laser and it's as simple as a stack of wood. A dozen planks of ply were cut to each hold a single puzzle and it's pieces. The front panel of the puzzle gets glued to the back panel and the whole thing is put on the bottom of the stack. The weight of the boards, stiffness of 12mm ply plus some extra weights from my screw boxes hold all the puzzles perfectly flat while the glue dries. When the puzzle comes out of the top of the stack it's ready for it's paper coating and it can then go in the pile of completed puzzles. Simple but effective.