|Peter Penguin for Sharkweek Designed by Maker Advocate|
If so, Tinkercad is a great place to start. Tinkercad was created by Kai Backman and Mikko Mononen in 2011 to be an easy-to-use online tool for creating 3D designs that are ready to be 3D printed into physical objects. In June of 2013, it became part of Autodesk's 123D family of design products.
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Tinkercad Tutorial Video