1 Topic by satman49

  • satman49
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Topic: current draw of stock SD3 extruder heatcore

Any body know? I measured the voltage ,it's at ~12.3v .Before the resistor fried  it measured  2.6 ohm. Is that about right or not?

SD3, E3D hotend,linear bearing on x/y axis',pillow block bearing on y conneting rod, ball bearngs on front y axis, fan on y stepper motor.

2 Reply by elmoret

  • elmoret
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Re: current draw of stock SD3 extruder heatcore

That seems a touch low. The original nichrome hotends were around 6 ohms.

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3 Reply by satman49

  • satman49
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Re: current draw of stock SD3 extruder heatcore

SD 3 tech specs says: Nichrome powered extruder,  here is what mine looked like

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SD3, E3D hotend,linear bearing on x/y axis',pillow block bearing on y conneting rod, ball bearngs on front y axis, fan on y stepper motor.

4 Reply by danny

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Re: current draw of stock SD3 extruder heatcore

no, it should have been 6 ohms.

the fact that it was 3 likely means that the insulation on the nichrom inside teh heatcore failed and it shorted to itself, then draws more current and heats more (and too fast) and the insulation fails even fast over the rest of the wire, and the solder joints fail also...

if thousl be 6Ohm.

drawing 2 Amps, for 24W power.

the stock power supply is able to power a bigger heater.

5 Reply by Leghk

  • Leghk
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Re: current draw of stock SD3 extruder heatcore

That photo is the resistor type, not a nichrome heat core.

Good news, really - the resistor's a lot less trouble to replace.

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        SD3 + RAMPS + Lawsy Carriages + E3D + Borosilicate + ... : Cupcake