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Extruder Heating Resister - Technical details please

Flackster

Extruder Heating Resister - Technical details please
April 15, 2011 09:59AM

Registered: 13 years ago
Posts: 104

Hi,

Can anyone let me know the technical detail regarding the Extruder Heating Resister please.
(as per this [reprap.org])

I'm think enough so I can easily locate one online and order some

Thanks

Pete

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rhmorrison

Re: Extruder Heating Resister - Technical details please
April 15, 2011 10:07AM

Registered: 14 years ago
Posts: 3,742

Quote
Machining
The precise diameter of the hole in the heater block will depend on the heating resistor you use, so get that first and measure it. You need a 6.8 ohm wire-wound resistor. Ideally get a vitreous one like this, though I have used silicone-coated ones like this quite satisfactorily.

RTFW

Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

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Auzze

Re: Extruder Heating Resister - Technical details please
April 15, 2011 10:20AM

Registered: 13 years ago
Posts: 241

HI..

try here [www.mendelfactory.com]

Auzze

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AgeingHippy

Re: Extruder Heating Resister - Technical details please
April 15, 2011 06:40PM

Registered: 13 years ago
Posts: 482

Hey Flackster

If you decide you do not want to go for mendelfactory given the postage charges, or to the usual on-line suspects (again due to postage charges) you can take a look at this post for a source for a heater block and resistor.

Cheers

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Flackster

Re: Extruder Heating Resister - Technical details please
April 19, 2011 03:51AM

Registered: 13 years ago
Posts: 104

Cheers for the info guys - i've noted it down

I'm working out my best sourcing for spare parts (my current build is almost done and I'm getting a feel for the things that will break early on).

I almost screwed up one thermistor already (and am fairly sure I will do so fully soon)

Thanks

Pete

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katzlbt

Re: Extruder Heating Resister - Technical details please
August 03, 2011 04:44AM

Registered: 12 years ago
Posts: 9

How can it work to use a 3W Resistor for 20W power?

12V and 6.8R = 1.765A this is 21.176 Watts?

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nophead

Re: Extruder Heating Resister - Technical details please
August 03, 2011 05:28AM

Admin
Registered: 17 years ago
Posts: 7,879

Because the heater block acts a heatsink for the resistor so it can handle more power than it would in free air.

If you were to use a 20W resistor that would not get hot enough because it would be big enough to dissipate 20W in free air.