1 Dual projector (each projector must project a different wavelength range) vat photopolymerization 3D printer. 2 One light source must be centered at 365 nm (350 to 380 nm acceptable range) 3 One light source must be centered at 405 nm (minimum = 405 nm, maximum up to 525 nm) 4 Light intensity for each light source must exceed 150 mW/cm2 intensity to be viable. No maximum intensity. 5 System must be capable of projecting both light sources simultaneously. 6 Light sources must display parallel 2D images (e.g., through DLP processing); cannot be laser rastering 7 Printer firmware must achieve < 5 pixel alignment accuracy. 8 Software must enable processing of 3D files that contain two materials (each materials corresponds to one light source, therefore the software must allow for processing of dual wavelength files) 9 Modular hardware and software to allow for exchanging the light sources (e.g., reversibly changing the light source to a different wavelength in the future) 10 Software must support grayscale slicing (single and multi-channel) 11 Temperature control above 40 °C and up to 100 °C for vat, at least 40 °C for the chamber. No maximum limit for either the vat or the chamber.
