A photopolymerized prepolymer manufacturing system can create material suitable for 3D printing buildings or building components. The system can include a conveyor, a prepolymerization chamber, and one or more processors. The prepolymerization chamber can have multiple prepolymerization stations arranged in sequence and can convert untreated material into photopolymerized prepolymer material as the conveyor moves the prepolymer past the prepolymerization chamber. The processor(s) can control operations of the conveyor, the prepolymerization chamber, or both, to alter operations in response to a detected system event. Each polymerization station can include a light source, such as an LED array, that irradiates material. Each light source can be in a lid of the prepolymerization station. When operation of one polymerization station is halted, such as for maintenance, then the system can increase the light source intensity of the remaining polymerization stations, slow the conveyor speed, or both.