3d printing system for preparing a three-dimensional object

A three-dimensional printing system for preparing a three-dimensional object made at least partially of an expanded polymer, comprising:

• a printing device configured to prepare an expandable polymer melt and deposit a strand of expandable, expanding or expanded polymer onto a surface and
• a three-dimensional movement device configured to enable depositing of the strand of expandable, expanding or expanded polymer at a predetermined time at a precise position within the three-dimensional matrix,
• the printing device comprising
• a feed section at an upstream end of the printing device,
• a heating section,
• a pressurizing section,
• a blowing agent supply line,
• a mixing section,
• a cooling section and
• a terminal printing head section at a downstream end of the printing device including a die configured to deposit the strand of the expandable, expanding or expanded polymer onto the surface,
• the mixing section and the cooling section arranged downstream of the feed section, of the heating section and of the pressurizing section, the blowing agent supply line having one or more discharge end connected with one or more of the pressurizing section, the mixing section or the cooling section, the cooling section being a tubular section, which comprises a tube, and a Peltier element, a resistance heater, a heat exchanger or cooling fins disposed on an outer wall of the tube, and the pressurizing section comprising a piston compressor, a screw compressor or a gear compressor.