I wanted to use the laser cutter & my CAD knowledge to make a 3D structure so I made a pen holder out of paper. It seems simple but it was a learning experience. Trying to make a self-supporting rigid structure out of paper, without relying on folds / glue is tough.
The joints behave like hinges and I had to take care to load the paper in the right direction. The narrow hole in the top causes the pens to lean at an angle such that the pen’s center of gravity is centered with the holder, otherwise the heavy pen will cause the holder to fall over. It turns out the beam diameter of the laser cutter is a lot larger than the thickness of the paper, so you have to design the joints to an interference fit, because the cut dimension will be smaller & holes larger.