My 3D printer can produce complex shapes requiring very little manual intervention or finishing, with dimensional tolerances sufficient for my projects. For example, the LED-illuminated socket under the vacuum tube in Photo 1 came from the solid models I described in my DM 11.2 column; a scrapped hard drive platter mounts the socket to the printed base and a second RGB LED in the rectangular housing lights the tube from the side. An Arduino microcontroller, powered by the USB cable trailing off toward the right rear, computes trigonometric functions to produce slowly changing colors.
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