3D Hubs - Airbnb for 3D printing
Shapeways - Shapeways - 3D Printing Service and Marketplace
Zazzy - Design and sell your own 3D printed jewelry
Growmax.io - A smarter, simpler B2B eCommerce Platform for manufacturers, wholesalers.
i.materialise - i.materialise is an online 3D printing service, community and marketplace.
Gambody - Top 3D print premium marketplace online for video gamers