3D printing system for printing high melting temperature materials

A 3D printing system, comprising:

• a heated chamber;
• a printing base plate mounted inside said heated chamber;
• a cooling unit mounted outside and above said heated chamber;
• a printing nozzle having an upper side and a lower side including a nozzle tip;
• wherein said cooling unit is configured to surround said printing nozzle's upper side outside said heated chamber for cooling said printing nozzle's upper side and wherein said printing nozzle's lower side is mounted inside said heated chamber;
• a nozzle heating unit mounted inside said heated chamber and around said printing nozzle's lower side adjacent the nozzle tip and at a distance from an outer surface of said printing nozzle;
• wherein said heating unit is configured to heat said printing nozzle's lower tip to a temperature of more than 1000° C. and said cooling unit is configured to cool said upper side of said printing nozzle to less than 200° C. such that a high temperature gradient is established, in use, along the length of the printing nozzle, wherein said heating unit is an induction coil;
• an induction machine configured to activate said induction coil and further comprising a fluid/gas chiller connected with said induction machine and said cooling unit for providing one of fluid and gas;
• said 3D printing system configured to receive a printing material for printing a 3D model inside said heated chamber;
• a temperature measurement device mounted outside said heated chamber and directed, through a window in the side wall of said heated chamber, to a tip of the printing nozzle;
• said temperature measurement device configured to measure said printing nozzle tip's temperature;
• and
• a power source to provide power to said nozzle heating unit, and a printer controller configured to continuously or periodically receive temperature measurements from said temperature measurement device and change the power provided to said nozzle heating unit accordingly.