Shapeways - Shapeways - 3D Printing Service and Marketplace
Stratasys Direct Manufacturing - Custom 3D printing services.
i.materialise - i.materialise is an online 3D printing service, community and marketplace.
3D Hubs - Airbnb for 3D printing
Sculpteo - An online service that provides professional online 3D printing and laser cutting services for...
Prototype Hubs - Prototype Hubs is an online service that provides professional 3D printing and CNC laser, plasma, and waterjet cutting services for on-demand production of prototypes, individual products, and mass production parts.