Hi guys

I'm wondering if anyone has experience with 3D printing commercial grade silicone rubber directly?
No molds. We aren't interested in rubber-like SLA materials either but something more like an extruder dedicated to printing RTV Silicone. I have seen the Discov3ry extruder by Structur3d and as far as I can tell that's the only solution currently available on the market. Which brings me here - has anyone found an alternative?

Appreciate the help and any input!

Andrei