3D Design & Software

There are a number of online resources you can use to find 3D designs created by others, including the following:
Cults > A French community and marketplace where modelers can share or sell their designs. Cults has a collection of high quality models for download. 
Thingiverse > MakerBot's Thingiverse is an online design community for discovering, making, and sharing of 3D printables.  
Instructables > A DIY project repository, that features many 3D projects, with sharable .stl files. 
YouMagine > Similar to Thingiverse, YouMagine is a community website run by an open source 3D printer company - Ultimaker. 
My Mint Factory > 3D model repository managed by iMakr. The site contains 3D models designed by professionals, with all uploads having been tested for quality. 
AutoDesk123D > A suite of computer aided design (CAD) and 3D modeling tools aimed at hobbyists. In addition to the tools, AutoDesk provides users space to upload and share their creations. 
Bld3r > Billing itself as a 3D printing social network, Bld3r is a thriving community of makers who like to feature their creations. Users vote on best creations, resulting in highly voted designs having better exposure. 
GrabCad > The biggest free, 3D models repository website. One shortcoming - the site doesn't offer a "3D printing" filter, which makes it difficult to know which designs are ready for 3D printing. 
Cubify > A 3D Systems website that offers free and paid designs. 

If you prefer to create your own original 3D designs, use some of these programs:
AutoDesk 123D > Easy to use, yet powerful, modeling tool with library of existing components, or the ability to create from scratch.  Windows, Mac, Online tool     
TinkerCad > A great tool for beginner designers. Complex design concepts introduced in step-by-step quests. Runs in browser. Online tool 
3D Tin > Another web based program that uses WebGL (Web Graphics Library).  Free as long as you share your designs under Creative Commons. 
Blender > A powerful application with full-fledged professional tools, Blender has an extensive library of resources to help you learn. Windows, Mac, Linux 
FreeCAD > An open source, parametric 3D modeler, great for home users, hobbyists, and experienced designers. Parametric modeling allows for easy design editing. Windows, Mac, Linux
Open SCAD > This is not a design tool. Instead, Open SCAD is like a programmatic 3D-compiler that reads a script containing 3D geometry definitions, and generates a solid 3D model as output. Windows, Mac, Linux, BSD
Sculptris > A free, introductory sculpting tool, created by the makers of Zbrush. A great stepping stone for digital sculptors. Windows, Mac
SketchUp > Drawing based tool for architects, designers, builders, engineers and makers, who design for the physical world. SketchUp is a free version of SketchUp Pro, which offers additional functionality. Windows, Mac
Staff will be happy to assist you in accessing these tools.
Please note: files will need to be in .stl format so that they can be converted using the CubePro software. For instructions on using the 3D printer software, you are strongly encouraged to complete the Intro to 3D Printing at MPL program (information available on the MPL website).