Stronger Carboy Stopper Clamp

Remix of Carboy Stopper Clamp from @TheWalrus with additional reinforcement and 10mm stopper height (instead of 5mm). The original is well designed, and this has just a few minor tweaks. This device keeps wet stoppers from slipping out of glass carboys used for homebrewing.

I printed the original Carboy Stopper Clamp initially, but it separated under the pressure from the stopper trying to come out. The failure point was at the thinnest point of the sidewall, just at the top of the carboy.