If you go and print one of the standard 35mm test cubes on a resin printer and measure it precisely, you will probably find out that it doesn’t have 35 mm, but only 34.8 mm. ![]() They are complex, so we will dedicate a separate blog post on this topic in the future today we will start with the basics. However, since we print quite complex geometry layer-by-layer there are some interesting phenomenons that need to be taken into account. We will also show you that you can easily use this test to precisely tell if you overexpose your model or not. That is usually roughly 50 µm + the inaccuracies in your measurement setup. ![]() After reading this post, you should be able to calibrate your resin printing process such that the models you print will come out perfectly within the accuracy of a single LCD pixel. Today, we will explore how serious the shrinkage is, whether it is the only source of dimensional inaccuracy and how to measure it and compensate. Therefore, when you try to print, e.g., an enclosure for PCB or a hole for a pin or a screw, they might not fit. The simple consequence is that the models you print either on FDM or resin printer are smaller than you designed. ![]() That means that their volume shrinks down during the process. Most polymers shrink when they cure or solidify.
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