I just got a 3D Printer and am still in the setup phase so I have not done a lot with it. E.g., I am waiting on a new fan for better ventilation.
The Slicers are telling me there are an enormous number of errors in my Rhino STL files that are generated from closed polysurfaces. The slicers always say there are holes. And I mean hundreds of holes.
I have not gotten far enough along to see if this causes problems downstream.