[EricH]

There aren't exactly a lot of sources of mecanum wheels in the FRC size range. AndyMark is the biggest (and to some extent, the only) one.

You may want to get in touch with 357 (or, the Behind the Design books from the 2006 and 2007 FRC seasons); they've got casting their own down to a fine art.

Or, if you can find someone who can build them directly with a direct manufacturing machine, that might do it. Just watch out for FRC cost rules--the material can get pretty expensive.

Matt, offseason is the best time to do mecanum. Not during the season. 330 spent 2 offseasons prototyping a set before giving them a chance to make a competition robot in the build season.