Go the the Tinkercad Web Site (https://tinkercad.com)
Tinkercad is a web based 3D modeler that uses geometric shapes and "holes" for adding and subtracting geometries to create 3D models of shapes.
Design a button using the scripted 3D lesson in the pdf attachment - copied from Getting Started with MakerBot by Bre Pettis, Anna Kaziunas France, and Jay Shergill. The step-by-step instructions are also available as a Google Slideshow that can be viewed in your iPad while you make your 3D model in TinkerCad on your laptop.
Web Post (30 points total):
2017 MS Fab Lab
2017 HS Fab Lab