I had to saw my Sphero open to replace its batteries (lesson learned - don't leave it charging). Its guts are very similar, and I used some plastic-specific adh

I had to saw my Sphero open to replace its batteries (lesson learned - don't leave it charging). Its guts are very similar, and I used some plastic-specific adhesive and then clear repair tape to hold it shut. Ideally the shell would have screwed open and shut, given the wall thickness (I have seen some other repair / upgrades that used clear plastic balls, like xmas ornaments, as the replacement shell). The polycarbonate is very strong, my Sphero once fell ~12 feet onto hardwood, without any damage - physical, mechanical, or electrical.