I saw this on youtube https://www.youtube.com/watch?v=fD-zIUYhHps and thought it would be a good challenge to try and figure out how it works and try and model it in SolidWorks. It took me a while to figure out but I finally sorted it out. I haven't printed this yet as I'm waiting for a replacement print bed to arrive. I don't anticipate any issues though so it should be safe to print. 3 of these will make a 4 inch cube which is quite large, you might want to scale it down before printing.