A three-dimensional printing system includes a resin vessel, a build tray, a movement mechanism, a sensor, a light engine, and a controller. The resin vessel is configured to contain photocurable (radiation curable) resin and includes a transparent sheet. The transparent sheet has an upper surface that defines a lower bound for the photocurable resin. The build tray has a lower surface configured to support the 3D article. A lower face is defined by either the build tray or the 3D article. The sensor is configured to output a signal indicative of a vertical position of the transparent sheet. The light engine is configured to image a build plane that is proximate to the upper surface of the transparent sheet. The controller is configured to control motion of the movement mechanism based upon analyzing a signal from the sensor including determining a maximum deflection of the transparent sheet during motion.