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Tinkercad is a free-of-charge, online 3D modeling program that runs in a web browser. Tinkercad is widely used in schools and beginner maker communities because its simple interface allows users with little or no prior experience to learn basic 3D modeling concepts. Since it became available in 2011, it has become a popular platform for creating models for 3D printing as well as an entry-level introduction to constructive solid geometry in schools.