I think it's going to be tough to find exactly what you are looking for.

There are filaments that are similar to Silicon though. Ninja Flex and FilaFlex both make a very flexible printer filament, which could feel pretty close to silicon. These can be printed in almost any fdm printer I believe.

Otherwise there are Silicon 3D printers out there but I have no clue how reliable they are. Here are a couple from china
http://www.alibaba.com/product-detai...558426400.html


And this one
http://www.alibaba.com/product-detai...719798739.html
But this one is only for making bags.

Ron