I have been trying to fast render an item (It normally takes 3.5 hours in non-fast rendering, and still fails) I have a number of questions, based on the console messages I get, such as - [fast-csg-remesh] Skipping remeshing of patch with 60 faces as it seems to have holes. I have no idea where/how these holes are generated, or how to remove them, since there is no indication of the region in which they occur. It carries on rendering, and the final object looks OK, and can be saved as stl, obj, off, etc., but can not be sliced properly in Cura/whatever. It also has numerous messages such as  - [fast-csg-remesh] Remeshed from 716632 to 556898 faces (22 % improvement) so does it stick its remeshed parts with those it couldn't remesh? what is the point in that, if the result is still unusable? Is the remeshing generating holes? What exactly is meant by a hole when it comes to fast render? What comprises a geometry? Geometries in cache: 198 Geometry cache size in bytes: 59274568 CGAL Polyhedrons in cache: 26 CGAL cache size in bytes: 80009904 Total rendering time: 0:01:58.050 Top level object is a 3D object: Facets: 556898