The "difference" operation in openscad creates artifacts on render if the bit you're subtracting doesn't exceed the borders of the bit you are starting with -- it creates a sort of shimmery plane in preview that's pretty annoying (although it doesn't impact the fully rendered part)
I've added a simple fix here that adds 0.01mm of extra size to the parts being subtracted so that rendering artifact goes away.
The "difference" operation in openscad creates artifacts on render if the bit you're subtracting doesn't exceed the borders of the bit you are starting with -- it creates a sort of shimmery plane in preview that's pretty annoying (although it doesn't impact the fully rendered part)
I've added a simple fix here that adds 0.01mm of extra size to the parts being subtracted so that rendering artifact goes away.