This adapter is commonly used in mousetrap cars to mount wheels made from CDs or DVDs. The inner hole is made for a snug fit with a 3/16" diameter wood dowel which becomes the axel. The OpenScad file allows you to make changes for your dowel diameter.
Print with the standard profile: 2 shells, 15% fill, 0.27 mm height. It is an interference fit with the CD or DVD, and a tight fit with the 3/16 inch wood dowel.