A heater chip for use in a printing device that includes a first heater array with a left side and a right side and a first ink via placed on the left side of the first heater array. Therein, the request relates to a change of membership to a group and the group relates a service to a host of the service in a communication network. The temperature of the first injector is estimated based on the temperature of the engine’s cooling water and the temperature of the fuel in the fuel passage from the fuel tank to the first injector, and the quantity of vapor generated in the fuel passage is determined according to the estimated temperature and the fuel pressure in the fuel passage. Second metal lines fill the second and third contact holes and the trenches above the second and third contact holes. The barrier is formed by directing a stream of pressurized air into a transition section between the heating and cooling sections of the oven. Various embodiments disclosed herein may permit reliable processing of 3D printed parts to effectively scale a 3D printing service to large volumes of orders for 3D printed parts.