This is one of a series of wheel prototypes FRC team 2363 delevoped. This wheel is for a 1/2" hex shaft. It uses 1 3/16" wide tread. When the tread is attached, the OD would be ~4".
In ReplicatorG software, the wheel goes face down on the bed, and is grown using "full support". This keeps the upper lip of the rim properly supported.
This wheel has the same spoked internal structure of the spoked wheel from which it was derived. Fairings were added to the inner and outer faces to protect the spokes and provide a smooth surface on which to build lettering or a logo in a contrasting color. The tread was narrowed to better match the Colson wheels we used this year, and to clear some fastener heads on our frame.
In addition, internal bosses were added for attaching fasteners for mounting the tread. Four small holes, visible in one of the pictures, show where the bosses are located.