My model layers are printing much as I expect but the parts when removed from the plate are very soft and flexible and fail to harden any further in sunlight or UV lamplight. A tall or slender part will bend and distort under its own weight while printing. I am using LCD-T resin, I have increased time and reduced thicknesses and am now using 0.04 mm layers at 20 s and 255 brightness with no improvement. Can anyone suggest what I need to change?
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4$\begingroup$ Could it be something wrong with the raw resin? How are you storing it (temperature and lighting conditions)? How old is it? $\endgroup$– Dan HulmeFeb 21, 2019 at 16:35
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$\begingroup$ can you run a hard-test of the resin by pouring a tiny sample onto a glass surface and leave it out in the sun? Don't tough it though $\endgroup$– TrishFeb 21, 2019 at 21:39
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$\begingroup$ This has nothing to do with post-processing. If the part is sagging in the chamber (or when removed from the plate), then the cure-time per layer (illumination time) is probably set too short. $\endgroup$– Carl WitthoftFeb 22, 2019 at 14:25
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2 Answers
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It might be the case that the resin separated into layers in the tray. Try mixing the resin well in its container.
I have also heard it can help to filter the resin prior to mixing.
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Thank you folks. The issue was bad/old resin and left in the tank too long. Replacing all my stocks with fresh and following rigorous stirring and decanting I now have resin curing well during the print. Sorry to have taken so long to get back to it.