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Prusa MK3s Light Nozzle R4

by Devilscave Jun 16, 2019
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Do you find that the 1k resistor gets quite hot? I did a quick bench test with a 1/2 watt 1k resistor, 2 white LEDs in parallel, and a 24v supply and that resistor was getting uncomfortably hot to the touch.

I am trying a different path, with a similar approach, but a lower value resistor (120 ohm) and my thought is to just use the 5v supply pins on the Einsy board (near the upper right corner). I haven't gone through the effort of hooking up to the Einsy board yet, but a quick bench test with the 5v supply has the resistor much cooler (as one would expect).

Just wondering if this is just an issue for me or if you are seeing this too.


EDIT: The LEDs I am using have a forward voltage around 2.8v. So by my calculation, a 1k resistor is dissipating about 0.42 watts (which should be OK for the 1/2 watt resistor - but it is toasty). I would not use a 1/4 watt resistor for that 1k. My 5v arrangement is only dissipating .044 watts so the 1/4 watt resistor there is plenty.

I use 3,4V whit 0,20mA Leds whit 18000mcd, the resistor Temp. is fine at me.

Do you have a photo of this showing it installed and illuminated? I would like to get an idea of the end result. Also a pic of the LEDs installed would be helpful. Good idea!

Currently I have no further data, but it is the same function with the R3 Light nozzle I made, just another form for R4.

Prusa MK3 Light Nozzle 45 degree R3/B7

Ah - that helps a lot. Thanks!

This is my solution on wiring - the 22 gauge (.64mm) wire is too large for two wires (one insulated), so this is my idea. Let you know if it works...(update: lights up perfectly - just have to install)

Looks good. In the flanks on the side , you can melt the wires in. They are for it.

One without and one whit isolation. You need really small wires.

The hole through the shroud will accommodate wire without insulation. Where should the wire with insulation be routed?