3D printer is the first innovation that is being used in many factories to build up dummy of products. But now I had seen a few company came up with 3D pen. Through which you can easily build up a model of things you want. I want to know how much costly it can be and does it is easy to use. For example if you want to build up a few models how to use it. It has some kind of frame or structure that can be used to make models.
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