The 3D printer code for the XV model drive wheel tread is at http://www.thingiverse.com/make:232141
No separate printing for Botvac
instead of XV is posted, but perhaps the wheels are the same size. You would have to glue the tread onto the rims as the fastening cannot be reproduced (the rims are probably molded onto the wheels when made at the factory).
A couple of replacement wheels alone are listed on ebay
, and several more with drive motors, complete assemblies, much more expensive.
There are services to 3D print things but fairly expensive if you do not have the printer and supplies yourself. They seem mainly for commercial makers of jewelry etc.
Another possibility is making a tread out of mouse pad foam rubber material as described earlier in this thread, which you would glue on -- simply strips of the material. Using a very tiny drill bit you might be able to insert cut off sewing pins into the rim as well, requires experiment.
Another material is harder foam mounting tape, which might be covered with an outer layer of softer weatherstrip foam. Or try other types of weatherstrip.
wheel is a little harder to work with than the XV because of the gear teeth molding into the rim -- cannot be penetrated by fastening pins.
I see Thingsverse has added a printing for the Botvac
drive pinion but still none for the wheel itself.