Prepping for 3D Print

Have you checked out my tutorial?

That might help answer some of your questions.

Also, I want to note that we now have a Printables feature on 3DWarehouse! Printables is a feature that makes it easier for millions of 3D Warehouse users to create, share, and print STL files. It’s built directly into 3D Warehouse, so there’s no need to download any additional plugins. Simply upload your SketchUp model to the 3D Warehouse, make it public, checkmark it Printable. From there, 3D Warehouse will hand your model off to Materialise’s Cloud Services which will analyze your model and automatically fix some of the most common issues that are known to hamper 3D Printing workflows. They will then generate a watertight STL file and send it back to 3D Warehouse where it will be available for you to download.

Making a model 3D Printable Knowledge Center Article.