# Prusa Light Bar

## by Acarius10, published Dec 18, 2012

Prusa Light Bar Dec 18, 2012
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# Summary

For attaching to the top of your Prusa to light your print bed.

# Instructions

1)Print (I did two)

2)Calculate the size of resistor you need using the following formula
R = (V1 - V2) / I

where:
V1 = supply voltage
V2 = LED voltage
I = LED current
(I used 6 LEDs, each at 30mA, therefore: 6 * 30 =180mA, so my value for I is 00.180)
My formula looked like:
(5-3.3)/00.180 = 9.4 A, so I used a 10 ohm Resistor

3)Solder together 6 LEDs into two groups of 3. Make sure they are equal distance apart for the holes. (I flipped the Light bar upside down and inserted the LEDs backwards, so as to hold them in place for soldering. I then soldered the leads together.)

4) solder the 2 Lightbars together using 2 strands of wire. Make sure that the Positive from one goes to the Positive of the other.

5)Solder 1 wire from a power supply to a 10 ohm resistor to the positive side of the Lightbars.
solder a ground wire to the negative side of the Lightbars.

6) Attach the Lightbars to the top of your Prusa using some zip-ties.

7)Make sure there are no short circuits, and plug the Lightbars into a power supply.

8) Turn on and enjoy a nicely lit Printer

**To Make changes to the OpenSCAD file you need the LED Module found here:
http://www.thingiverse.com/thing:38396

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I like the this bar, simple and effective. But LEDs should not share a single resistor when wired in parallel. Instead each LED needs it own current limiting resistor. So I used a 12v power source, with LEDs on each bar in serie, sharing a common 110 Ohms resistor on the cathode of the last resistor. I made two bars wired in parallel.

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