I've been browsing plugins for sketchup, but as a fairly new user, I'm not certain which ones are actually useful for 3d printing. Maybe we should have an aggregate list of plugins and what they enable you to do (in plain English) for people who are new or still learning. Error Checking Solid Inspector - scans for potential print errors and highlights them. Object Creation Shapes - quickly generates primitives (sphere, triangle, box, etc). Export/File Conversion SKP to STL to export STL files directly from Sketchup Here is a large number of plugins for making organic models (Organic models are people, animals, plants, etc).