Manufacture objects from plastic line, like fishing line, that's melted and fused together into successive layers.
Grabcad features.
Getting started with Grabcad.
Skip to step five unless you're installing grabcad on your own computer.
FDM printing guide
This is a very good introduction to 3D printing with Grabcad
3D print design guidlines.
Guide to support material
Wish list of 3D printable material.
Stratasys website