Yes, even this design can be a FREE download once I am fully funded for my RoboGuts™ S.T.E.A.M. Education Program Kits;

IF each viewer donates just $5 I'll be funded almost overnight and then all my designs become FREE downloads!  

The fastest and cheapest way to get all my .STL files FREE is to donate $5 to help fund school materials ... once I have $3,500 I'll convert all these files to FREE downloads.   https://www.gofundme.com/roboguts-kits-lessons

This is a nice fat wheel for making a mars rover type looking vehicle ... the hub ties to a servo motor/servo horn or up to 6mm motor axel. This is another of many entries to the makezine.com/go/makerbot contest ... blog.makezine.com/archive/2010/04/makerbot_giveaway.html I really need a job ... but I can design a custom part if you like on contract. Instructions MakerBot four of these and build a rover ... If you successfully make this with a 3D printer please send me the build-file and machine type so it can be uploaded here for others to use.