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Are you able to get the colour output needed for curing the resin with an LCD screen? I have some concerns it may not work, as it's a pretty precise wavelength, and depending on the LCD, it may not be reproducible. Have you thought about using a monochrome OLED display and a light filter that only lets light at 450nm through? I feel this might be easier to reproduce.
Also, You should think about adding walls to the side that'll filter all wavelengths that would cure the resin (such as an orange or red tinted acrylic).