I’m also using them. After spending a couple weeks 3d printing the cookies, a piece of rubber needed to be glued to the top and bottom to provide an anti slip material. A circle from a failed print was a good template to use on the rubber drawer liner that was found at a big box store. The cookies are impressive. There is 50-75 lbs on each cookie and they did not fail. When working with plastic, there sometimes can be an assumption that plastic breaks easily. These are strong. The designer made sure these were sturdy. This was another find on thingiverse.com