jm + plastic   2

In first, 3-D printed objects connect to WiFi without electronics
This. is. magic.

Physical motion—pushing a button, laundry soap flowing out of a bottle, turning a knob, removing a hammer from a weighted tool bench—triggers gears and springs elsewhere in the 3-D printed object that cause a conductive switch to intermittently connect or disconnect with the antenna and change its reflective state. Information—in the form of 1s and 0s—is encoded by the presence or absence of the tooth on a gear. Energy from a coiled spring drives the gear system, and the width and pattern of gear teeth control how long the backscatter switch makes contact with the antenna, creating patterns of reflected signals that can be decoded by a WiFi receiver.
magic  wifi  whoa  3d-printing  objects  plastic  gears  springs 
4 days ago by jm
Make Your Own 3-D Printer Filament From Old Milk Jugs
Creating your own 3-D printer filament from old used milk jugs is exponentially cheaper, and uses considerably less energy, than buying new filament, according to new research from Michigan Technological University. [...] The savings are really quite impressive — 99 cents on the dollar, in addition to the reduced use of energy. Interestingly (but again not surprisingly), the amount of energy used to ‘recycle’ the old milk jugs yourself is considerably less than that used in recycling such jugs conventionally.
recycling  3d-printers  printing  tech  plastic  milk 
march 2014 by jm

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