[sudo-discuss] TAZ 3D printer needs a heating resistor

[Patrik D'haeseleer]

Sorry for trying to be helpful, but I don't think you could expect me to
magically know those details. It just seemed better to use the Lulzbot
resistor that you listed in your first email.

Patrik

PS: the resistor recommended by Lulzbot is available on Digi-Key for $1.50
<https://www.digikey.com/product-detail/en/vishay-sfernice/RWM06224R70JA15E1/RWMB-4.7CT-ND/1587939?utm_adgroup=Resistors&gclid=CjwKCAiAhfzSBRBTEiwAN-ysWEwePIQ6Rl2PioHblQy56f0W38XUWEMqlF8XKOAmPfNA1bfxALw10BoCBPwQAvD_BwE>
- might not help if it's the wrong resistance tho.

On Wed, Jan 17, 2018 at 3:48 PM, Jake <jake at spaz.org> wrote:

> Patrik if we don't glue it in, it won't make thermal contact with the
> aluminum
> block and will burn out.  Thermal paste gets squeezed out when the resistor
> heats up and expands and then you end up with a gap and the resistor burns
> out.
>
> We already went down the road with the Lulzbot resistor that is out of
> stock,
> permanently.  It's also the wrong resistance, and the software patch to
> compensate for that fact doesn't work.  I carefully chose this resistor
> value
> (8 ohms) and the thermally conductive epoxy that I want to use to glue it
> in.
>
> if you want to take over this project go ahead, but sowing doubt and
> uncertainty will just leave us with no 3D printer for another three years.
>
> -jake
>
>
> On Wed, 17 Jan 2018, Patrik D'haeseleer wrote:
>
> On Wed, Jan 17, 2018 at 4:04 AM, Jake <jake at spaz.org> wrote:
>>
>>
>>> If someone gets the resistor shaved to fit in there, i'll bring in the
>>> special two-part thermal bonding epoxy and glue it in, and then i'll
>>> hook up
>>> the wires and we'll have a 3D printer again.
>>>
>>
>> Don't glue it in place with epoxy, or you'll have to drill it out when it
>> burns out again. It should be a tight enough fit to hold in place by
>> itself,
>> no? I would expect regular thermal paste to conducts heat better than the
>> epoxy anyway...
>>
>> Patrik
>>
>> PS: the replacement resistor that Lulzbot sells is only $3.50, and I would
>> expect that one to fit the hole like a glove. They seem to be out of stock
>> right now though...
>>
>
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