Create a DLP 3D Printer Grayscale Mask Guide

Start to finish guide on measuring and correcting the light output of a DLP 3D Printer. The link to download the mask generator software is located here: https://www.patreon.com/GarageScience

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If you would like to use the phororesistor data point matrix I used you can access it here: https://drive.google.com/open?id=0B6ko0iKoNkCJQ0NkMmdtWGgzeUU

Anyone that's used a DLP 3D Printer is well aware of the variation in light intensity across the projection area. This property can be very frustrating and my even be extreme enough to limit printing capabilities. This mask generator software takes data about your projectors output and creates a grayscale mask that reduces the high intensity portion of the projection and brings them down to the same level as the low intensity areas.

This is a very straight forward guide and doesn't require any special equipment. All that is needed is an ohmmeter and a photo-resistor. Because the mask generator software creates a grayscale mask based on the difference between data points you don't actually have to get actual magnitude of light intensity. All you need is something that provides an output that is proportional to light intensity which is what the photo-resistor provides.

Please note that I have a UV pass filter installed in my projector which is what creates the deep blue projection. If you are using an unmodified projector I don't know if you will get different results because the photo-resistor will measure all light. It may be difficult to measure UV output if it's output has a different gradient across the projection area than the visible light.

If you have questions leave me a comment and I will try and help as much as possible.

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