Add Yahoo as a preferred source to see more of our stories on Google. The best 3D pens; as represented by a person using a 3D pen The best 3D pens enable you to 'draw' in three dimensions using heated ...
A $50 (£32) pen called 3Doodler lets you draw three-dimensional shapes using a special plastic 'ink' that hardens almost as soon as it is released from the nib. The pen has a chamber that heats and ...
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