www.thisiscolossal.com/2013/02/the-worlds-first-3d-printing-pen-that-lets-you-draw-sculptures-in-real-time/

Instead of drawing in 2D and having your 3D vision realized after finalization and printing, the 3Doodler allows you to draw in 3D. A possible predecessor to Solid Works, 3Doodler could become a way to draft our your ideas and verify dimensions and angles before plugging numbers into Solid Works. 3Doodler is desirable because it allows artists and users to draw precisely what they see and what they are thinking. The most difficult part of drawing is orienting perspective onto a 2D surface. Now, we won’t have to. 

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