Hi. I am curious if there are any others out there who use rhino for their 3D creations. I used the program throughout grad school and in various positions. I am not expert but I am adept. I am though running into some new issues with creating models for 3D printing - errors like too many shells or negative volumes. The whole issue of 2-manifold edges is new to me too. at any rate, I am wondering if there is anyone out there very experienced with rhino for 3D modeling who could help me trouble shoot a few things/help explain a few issues. I prefer to keep using this software as I am skilled with it and would like to build on that. Thank you!! Susan.