https://www.posetteforever.com/viewtopic.php?f=64&t=4012&p=45477#p45477
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Chromium
Sunday, 11 October 2020, 11:52 AM

Re: Black Spots On Renders
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It's artifacts.

There are two crease angles close together and the light ray bounces off one and misses the other, so it shows as a shadow.  Try adjusting to a higher crease angle like 120.

The other fix (if you've seen some of my renders), is to have a strong back light, it gives a nice glow on the edges.