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

[Jake]

i'll solder the wires and see if it heats up and prints! maybe Tuesday at 7pm

-jake

On Thu, 18 Jan 2018, Isaiah Abbatiello wrote:

> Aziz here
> I fit the resistor in the hole and glued it last night.
> What are the next steps?
>
>> On Jan 17, 2018, at 8:02 PM, Jake <jake at spaz.org> wrote:
>>
>> thank you for working on that.  if it doesn't fit we can spin a drill in there
>> a little bit until it fits, and then i'll glue it.  There are much better
>> nozzle designs out there by now so if it doesn't work out we can always replace
>> the whole block or nozzle later, i even have some of those parts laying around.
>>
>> i'm going to sudo now and i'll take a look at it.  thanks again!
>> -jake
>>
>>> On Wed, 17 Jan 2018, Patrik D'haeseleer wrote:
>>>
>>> OK - I shaved down the other side of the resistor, but the end cap of the
>>> resistor is starting to show through and it doesn't quite fit in the barrel
>>> yet. I'll leave it up to Jake to take off the final layers if he dares -
>>> I'm worried we might be getting some shorts against the heater barrel
>>> though...
>>>
>>> The alternative approach would be to buy a spare heater block (still
>>> available from Lulzbot for $15), and ream out the heater opening until the
>>> resistor fits. Not sure that's any easier to get a good fit though. Let me
>>> know if you like that idea, and I'll order the heater block.
>>>
>>> Patrik
>>>
>>>
>>> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon>
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>>>
>>> On Wed, Jan 17, 2018 at 6:25 PM, Patrik D'haeseleer <patrikd at gmail.com>
>>> wrote:
>>>
>>>> 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...
>>>>>>
>>>>>
>>>>
>>>
>
>