I am intrigued by the idea of 3D punting a house with concrete. I've been seeing these ideas going around for a couple of years. This week I read about ICON's project. I don't have the knowledge to start this from scratch so I am trying to glean information form ICON and others. I would love to be able to cheaply and quickly put up a house for the poor. I will first look at the idea in general. Once I begin the project I will write in detail. If you look at ICON's website it looks as if the first lay a slab, which will be the base for the large metal frame they use to hold and support the equipment. That means also that plumbing must be prepared in the slab also. Here is a picture from their website: If you zoom in you can see what looks like a hopper and a hose which would pump in the material.. that is my guess. Here is a video of the process: