[Tow]

Actually we used the white wheels from the KoP but we used duct tape to change it's atributes (it looses a lot of traction but gains speed). The thing I'm trying to say is that you don't need a 3D Printer or CNC to make your custom wheels you can modify any type of wheel. It's a lot cheaper but you have the risk that it may fail so, you need to check if it functions as you want.