You are right, one has to know what he does when 3D printing. This said, a good design and bare ABS printing can deliver lens boards that are able to take 2kg lenses without risk. One of the challenges is to make designs that are not prone to bend from thermal stretching during printing.
Another way is just printing a mold with Poliethylene and filling the mold with a very strong technical resin, than can even include cut fiberglass.
But I agree that a bad design or the wrong plastic can ruin a lens, of course...
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