Closed loop print process adjustment based on real time feedback

A method, comprising:

• providing a photoreactive 3D printing system, the system comprising:
• a chassis;
• an elevator system movably coupled to the chassis, wherein the elevator system comprises elevator arms;
• a print platform mounted to the elevator arms;
• a resin tub, wherein the resin tub comprises a membrane, and the membrane rests on a physical tension element such that an increasing downward force on the resin tub induces an increasing tension on the membrane;
• a membrane tension apparatus which applies a downward force on the resin tub;
• a resin pool confined by the resin tub and the membrane;
• an illumination system;
• a plurality of sensors comprising a resin bulk temperature sensor;
• and
• a print recipe comprising information for layers in a 3D printed part to be built on the print platform, wherein the print recipe comprises one or more of build geometry, illumination energy, exposure time per layer, wait time between layers, print platform position, print platform velocity, print platform acceleration, resin tub position, resin tub force, resin chemical reactivity, and resin viscosity;
• projecting an image through the membrane and focused at a polymer interface located within the resin pool using the illumination system;
• moving the print platform in a z-direction with the print platform velocity and the print platform acceleration using the elevator system;
• applying a downward force to the resin tub to induce a membrane tension on the membrane;
• measuring a resin bulk temperature in the resin pool using the resin bulk temperature sensor;
• and
• updating the print platform velocity and the print platform acceleration in the print recipe during a printing run based on the resin bulk temperature of the resin pool.