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3D printing killer apps
We know from this class that 3-D printers can be incredibly useful tools for prototyping and direct digital manufacturing for engineers and scientists. The costs savings are generally 90-99% as compared to commercial products. Are 3-D printers useful for everyday consumers?
What about killer applications? Are there free 3-D printable designs for products that make a 3-D printer immediately worth purchasing even if only to print out a handful of these products?
Killer Applications of 3-D Printing for Consumers
Please list [URL of design Name of object], cost, [url of commercial equivalent], sign/date with 4 tilde symbols