The future is now. We've got smartphones, electric cars, and, now, pens that write in 3D. An engineer's dream-come-true, these fascinating tools emit a line of fast-drying plastic so you can bring ...
"Hearst Magazines and AOL may earn commission or revenue on some items through these links." A 3D pen is a crafting tool that works a little like a hot glue gun, except what comes out is warm plastic.
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