The printing process of many 3D printers is hard to follow, especially with darker filaments, because of the absence of proper light coditions.This little unit, holds a 10 mm 100 mA led and solves this problem. With a power source of 12 Volts, you need a 1 Watt resistor of 86 Ohm in series with the led. Since ¼ Watt resistors are more common, it can be replaced by four 390 Ohm resistors in parallel. Push the LED al the way through the opening to make room for the four resistors. Use a piece of doubble sided adhesive foam to attach it wherever you want it.

Wanhao i3

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30+