I've got a molecular model which, when exported into WRL and opened in Meshlab, shows 15.7 mln vertices and 5.2 mln faces. The WRL is 311 Megs; the STL is 1.5 Gigs. I've printed smaller molecular models before, but this one is a rather large, irregular molecule. Zoom in >>> mesh looks just about acceptable, would not want to simplify, as this is for student teaching. The target size I have in mind for this is about 4x4x4 inches. Any ideas? Slice this up into 3x3x3 (27 cubes), print separately, glue? Is there a tool to optimize slice-placement (i.e. to avoid orphan non-connected blobs). SW strong plastic, or the semi-transparent one. Cheers! P.S. I tried to post a screenshot of my meshlab view, but there seems to be a bug in the image-placement in Crome. May be this is b.c. Meshlab has eaten the memory up. P.P.S. The input data for the surface are atomic coordinates, i.e. a bunch of spheres, dots, and lines in XYZ; that file is 'only' 30 Mb. Not sure if this helps, but may be SW printers can interpret non-mesh formats?