Designed to fit on the corner poles of my work table. Included fusion and step file for remixing. The top pole has a thread that fits into the top of the shelf. When printing make sure to block support for the threads. Recommend printing grid side down. You can also block support on the bottom of the grid units if you're confident in your bridging, but make sure to sport the grid unit with the pole passing through. Pole parts should be Creep resistant. I used PETG and PLA for the shelf.