Method for discharging a volume flow

A method for discharging a volume flow consisting of successive drops to produce a three-dimensional object of solidifiable material, which is either in a fluid phase at the outset or is liquefiable to yield a fluid phase, with the steps

• introducing the fluid phase of the solidifiable material into a material storage means,
• generating a pressure on the fluid phase of the solidifiable material in the material storage means,
• dropwise discharging the solidifiable material from a cyclable outlet opening to build up the three-dimensional object in a construction chamber
• wherein the fluid phase of the solidifiable material has a viscosity dependent on temperature,
• wherein at least one process parameter is tracked during the production of the three-dimensional object while maintaining the other process parameters, to adapt the drop size,
• wherein a change in viscosity of the fluid phase of the solidifiable material is continuously detected,
• wherein the pressure in the material storage means as the at least one process parameter is regulated via a closed-loop control in the event of a change in the viscosity of the fluid phase of the solidifiable material, while maintaining the other process parameters, to achieve a predetermined drop size, and
• wherein the pressure is applied by a conveying element, the average displacement velocity of the conveying element per discharged drop being converted as a measured variable into the control variable for the closed-loop control.