3D Modeling and Printing

General 3D information sites

3D Insider - 3D Printing Plans, Blueprints, and Designs

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3D Modeling Tools
OpenSCAD:
www.openscad.org
www.openscad.net Run OpenSCAD from your browser (only Google Chrome supported)
video introduction on OpenSCAD
video introduction on OpenSCAD by Patrick Conner

SketchUp
video introduction to SketchUp (Trimble)
pleasant3d

3D Model resources
www.thingiverse.com
www.3dcontentcentral.com/
www.shapeways.com/
cubehero.com
3D Insider

3D Printers in your neighbourhood
http://www.3dhubs.com

3D Printer kits
www.k8200.eu

3D Printer software
Repetier-host software, includes slic3r
video introduction on Slic3r
Introduction to Skeinforge for ReplicatorG and Makerware

About meshes and 2-Manifold issues
Mesh