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+--- Thread: overexposure to the sun (/showthread.php?tid=809)
overexposure to the sun - Ailos81 - 04-05-2021
Hi there,
I hope you are doing well
I have an very easy doubt ( I think so) , I printed some helmets, like 2cm high, very tiny, and they were going well.
I exactly repeat them , but these two new helmets looks like they are twisted or squeashed on one side. I cannot explain to myself. But after that I remember that these new 2 helmets were exposed to the sun for a whole day . Could the overexposure to the sun shrink or deform tiny pieces?
thanks a lot.
RE: overexposure to the sun - cliffyk - 04-06-2021
Yes, absolutely...
The printing process does not fully cure the resin, additional exposure to UV after after printing is essential. I made a curing chamber from an old 0.7 ft³ microwave oven--I took out the magnetron, transformer, capacitor, etc. and installed a 30W 405 nm LED in its place. 40 minutes in this chamber will fully cure any print.
I have found that the less expensive, and water-washable resins are most susceptible to extended exposure to sunlight (the WW resin also deteriorated significantly in strength) even after my post-printing curing. 2-3 hours iin direct sunlight s all you need. For anything (printed with any resin) to be placed in service with continuous daylight exposure I use a UV blocking aerosol primer as used for stabilizing printed documents.