I needed a large compass for some woodworking projects, and I'm not paying $80 for a compass, people. So I designed some 3D printed parts that attach to sections of 3/8" (10mm also will work) wood dowels. Epoxy works well to hold it all together. Currently designed around M5 hardware, but I've also included the native Solidworks (version 2020) file, so you can muck around however you like.