This is the 3D printer that I am most excited about right now. Kickstarter started on April 1st.
Its actually a clever idea. (april fools aside)
Foams can be instant setting and solid. Think instant styrofoam.
then it is instantly ready for lost foam casting.
so whatever you print can be made into a metal version.
Think a slower flow of silly string or foaming gap sealer that we are already familiar with. Also no heated bed/nozzle issues.
The print-head nozzle be as narrow as a syringe depending on the type of foam being printed
You should run kickstarter for it 