I started developing a Arduino-based sex toys back in 2012. All hardware was just to big, had no possibilities for remote controls etc. Therefore I developed a small Arduino derivative "body interaction vibrator development board" based on the JeeNode boards. In 2012 I already experimented with silicone overmolding but the results were just ugly. Then 3d printing came into my life and I experimented with 3d printed cases for the body interaction board. Very impressive is the 2- way (or even n-way) communication between the vibrators which allow for syncronization as well as remote control. But 3d printed vibrators are know to be hard to clean, you need a very good printer to get usable results or you must use a professional printing service to get good results.