Topic: What are the specs for the heater core resistor?
Resistance range?
Max power?
Dimensions?
I'd like to buy a few since they tend to burn out a lot.
2 2013-07-17 02:29:23 (edited by adrian 2013-07-17 02:32:03)
Re: What are the specs for the heater core resistor?
Replace it with a heater cartridge... cleaner, faster, more reliable, longer lasting.
But otherwise, if you just want like for like, ACS-5S-4R7-J is the partnumber. http://www.mouser.com/ProductDetail/Arc … 1Gyg%3d%3d is one distributor.
Arcol branded 4.7ohm (5%), 5 watt, wirewound through hole resistor.
But at $1 + postage a piece.. I'd just as soon spend the $9 on a cartridge once 
Re: What are the specs for the heater core resistor?
Thanks! Can you point me to the heater cartridges you're talking about? Also, do they just fit in the hole left by the resistor or is there some more work involved?
- 2n2r5
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Re: What are the specs for the heater core resistor?
http://store.qu-bd.com/product.php?id_product=23 here is an example of a heater cartridge
SD3 w/ mods:
Glass bed with QU-BD heat pad upgrade, threadless ballscrew w/ 8mm smooth rod, spectra line belt replacement, lawsy MK5 extruder, Lawsy replacement carriage, E3D hotend, Ramps 1.4 w/ reprap discount controller, DRV8825 drivers, 12v 30A PS, Acrylic case, Overkill Y-idlers, Filament alarm, Extruder fan + more.
Glass bed with QU-BD heat pad upgrade, threadless ballscrew w/ 8mm smooth rod, spectra line belt replacement, lawsy MK5 extruder, Lawsy replacement carriage, E3D hotend, Ramps 1.4 w/ reprap discount controller, DRV8825 drivers, 12v 30A PS, Acrylic case, Overkill Y-idlers, Filament alarm, Extruder fan + more.
5 2013-07-17 04:37:20 (edited by adrian 2013-07-17 04:37:34)
Re: What are the specs for the heater core resistor?
what 2n2r5 said .
You can find them cheaper, but two things to be wary of:
a) diameter : the linked one is 5mm, so should fit perfectly in the existing hole. There is lots of 6mm ones though, and to use these, you need to use a 6mm drill bit and just using your hand ream out the hole to fit them. Where you have a choice, get a 5mm one..
b) recently, a batch of potentially 'mislabelled' ( appear to be 24V cartridges labelled as 12V ) and 'out-of-round' (wont fit in the hole without making it very oversize) cartridges have turned up around the places. This so far seems to potentially be limited to the 6mm variants.. but who knows right ?
So shop with impunity for the cheapest deal - but look for a 5mm one
12V 40W is the magic numbers you want...
Re: What are the specs for the heater core resistor?
Many thanks Adrian and 2n2r5 - I'm not looking for the cheapest but I want one that will last me a few months and not burn out after 2 days
I'll buy the one from qu-bd you recommend and will circle back if I have any issues with its installation.
Thanks again!
Re: What are the specs for the heater core resistor?
just to do some expectation management - the cartridge is longer than the resistor, meaning it is going to sick out both sides of the heater core a bot more. This can also present a problem with the as-supplied rubber-mat insulation.
My suggestion is to also make sure you have Kapton Tape, and purchase some cotton-insulation from QU-BD... you can then re-wrap the header with ease.
Re: What are the specs for the heater core resistor?
adrian wrote:
just to do some expectation management - the cartridge is longer than the resistor, meaning it is going to sick out both sides of the heater core a bot more. This can also present a problem with the as-supplied rubber-mat insulation.
My suggestion is to also make sure you have Kapton Tape, and purchase some cotton-insulation from QU-BD... you can then re-wrap the header with ease.
Adrian I was going to upgrade to that cartridge heater and have some spare aluminum, so I was going to make a new aluminum block to fit it. Do you know the length of that 5mm cartridge heater? I'd like to get the piece made while it ships to minimize downtime
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Re: What are the specs for the heater core resistor?
20mm's is a common length - but you can actually buy them in a multitude of diameters and lengths (they are used extensively outside of 3D printing to heat dies and moulds, engine sump heaters, and much more...)
So I would say you'll be right working with 5mm(D)x20mm(L) as a spot check of my collection here shows them all to be within the ballpark of that - but you would probably be best to confirm that with your relevant vendor to be sure ...