It wasn't that long ago when printing something involved at least one sheet of paper and some ink. In recent times this has changed to no sheet of paper, an engineering plan and some exotic printing materials.
The 3D printer has been around for a while now. It started with a simple plastics-based version that could print small objects like chess pieces or cogs.
Newer versions allow you to print using chocolate and a range of other substances. There are even proposals for machines that could "print out" a new body part like a replacement artery. People have successfully "printed" a pistol that fired over 200 rounds without breaking down. A fashion designer brought out a range of printed shoes in various colours and configurations.
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