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40 lines
1.7 KiB
40 lines
1.7 KiB
7 years ago
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To make the pixel, 3D print all 7 parts.
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The pixel insert (screw) should be in one colour. The case and guide should
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be in a contrasting colour. The small parts can be in any colour, and are
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only visible from the back.
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Print one pixel before trying to scale up. Some of these objects are difficult
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to print and will require a well set up 3D printer.
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I printed the large parts on an Original Prusa i3 MK2S and the small parts
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on a Creality CR-10. The printing time was of the order of two weeks plus
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failures and spares.
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There is some redesigning that would be helpful before scaling up.
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The pixel also requires 2 nails and a Tower Pro SG90 servo motor.
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Driving the system requires a Pololu Mini Maestro 24-channel USB Servo
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Controller for each 24 servos.
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https://www.pololu.com/product/1356
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Also required is a suitable 5 volt power supply. I used a Mean Well RS-150-5
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for each servo controller. The worst case current of the servo is around an
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amp, and while the average current will never reach anywhere near that, I sized
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the power supplies accordingly so that they should never shut down due to
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transients. The PCB trace on the servo controller is unlikely to be able to
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handle that much current for long.
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Note that the pixel grid will need external mechanical support. I used parts
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from a couple of monitor stands, but any sturdy vertical pole on either side
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should suffice. Black cable ties will then hold it steady.
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Assembly should be done carefully. Most parts are push-fit, but that does
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rely on 3D printing tolerances. You may need to slightly adapt some of the
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sizes in the source files to your printer, or be careful about how much
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you file or cut away the rim of the first layer.
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Prototyping with a single pixel is essential.
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