CAL PRINT PREDICTION

I joined the CAL lab in Fall 2018 and have continued research there ever since. CAL (Computed Axial Lithography) is a rapid volumetric photopolymerization 3D printing method - rather than creating a part layer-by-layer like most additive processes, the entire volume is being cured spontaneously. One of my first projects was creating an improved dose visualization, shown below. Since the kinetics of the CAL process are so much more complicated than other additive processes, an efficient computational print time prediction simulation has not been developed yet, and thus, print completion is determined by the user. This print dose visualization is the first step in assisting users to determine at what point a print is completed.

My current project is the next step in print time prediction. I intend to train a machine-learning algorithm to use parameters generated during the slicing process of the CAL algorithm to predict how long a given geometry will take to print. The general process is outlined below.

This first polynomial-based iteration could use a linear regression model rather than a genetic algorithm to find the optimal parameter set. However, with the intention of including a multi-physics simulation in the print time prediction at some point, the genetic algorithm provides more flexibility. As of Summer 2020, myself and a team of undergraduates are still gathering print time training data to feed into the genetic algorithm. This will ultimately be a proof of concept to see if a simplified method of prediction can be effective for CAL.

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KEVIN
COULSON