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2020 extrusion cap with LED

2020 extrusion cap with LED

thingiverse

Humans connect small LED drivers based on the TIP120 transistor. The driver hooks up directly to the Ramps servo pin, D4, and is controlled by G-code commands that turn the LEDs on at print beginning with M42 P4 S18 and off at end with M42 P4 S0. I stick strictly to an 18 duty cycle for LED usage because plastic starts melting after only five or ten minutes of continuous illumination.

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