PolyShaper is a new open source technology distributed under the CERN Open Hardware Licence, that allows to model the polystyrene with the support of CNC machines. This technology is the equivalent for the polystyrene which the common 3D printings were for the plastic. The core of this technology is the new tool, based on a hot wire, that reproduce the shape of a common mill tool, able to cut the polystyrene. This allows to use a common CNC machine, CAD/CAM software and to reproduce your ideas on polystyrene. We strongly believe on the open source but overall we do not want that this technology remains chained to a patent (as happened to the 3D printing that had his glory just after the expiration of the key patents). You can join to the community in order to share your projects, improve this technology and, overall, show to everybody how you use the PolyShaper technology.