I scaled this up in the x/y in order to fit standard sized gift cards in the cylinder. As it developed, it's become somewhat large but still works great. I prefer ABS and picked up a bit of warping on the base, which makes the last level of the maze a bit sticky, but that's okay too. It takes just a tiny bit of extra force to get it moving or to close it completely. I'll pop a couple photos in the I Made One area, with a gift card in the photo for scale.