<div dir="ltr">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...<div><br></div><div>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.</div><div><br></div><div>Patrik<div><br></div></div></div><div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br>
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</table><a href="#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1"></a></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jan 17, 2018 at 6:25 PM, Patrik D'haeseleer <span dir="ltr"><<a href="mailto:patrikd@gmail.com" target="_blank">patrikd@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>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.<span class="HOEnZb"><font color="#888888"><br><br></font></span></div><span class="HOEnZb"><font color="#888888">Patrik<br></font></span><br></div>PS: the resistor recommended by Lulzbot is <a href="https://www.digikey.com/product-detail/en/vishay-sfernice/RWM06224R70JA15E1/RWMB-4.7CT-ND/1587939?utm_adgroup=Resistors&gclid=CjwKCAiAhfzSBRBTEiwAN-ysWEwePIQ6Rl2PioHblQy56f0W38XUWEMqlF8XKOAmPfNA1bfxALw10BoCBPwQAvD_BwE" target="_blank">available on Digi-Key for $1.50</a> - might not help if it's the wrong resistance tho.<br></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jan 17, 2018 at 3:48 PM, Jake <span dir="ltr"><<a href="mailto:jake@spaz.org" target="_blank">jake@spaz.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Patrik if we don't glue it in, it won't make thermal contact with the aluminum<br>
block and will burn out. Thermal paste gets squeezed out when the resistor<br>
heats up and expands and then you end up with a gap and the resistor burns out.<br>
<br>
We already went down the road with the Lulzbot resistor that is out of stock,<br>
permanently. It's also the wrong resistance, and the software patch to<br>
compensate for that fact doesn't work. I carefully chose this resistor value<br>
(8 ohms) and the thermally conductive epoxy that I want to use to glue it in.<br>
<br>
if you want to take over this project go ahead, but sowing doubt and<br>
uncertainty will just leave us with no 3D printer for another three years.<span class="m_3213126353257298477HOEnZb"><font color="#888888"><br>
<br>
-jake</font></span><div class="m_3213126353257298477HOEnZb"><div class="m_3213126353257298477h5"><br>
<br>
On Wed, 17 Jan 2018, Patrik D'haeseleer wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On Wed, Jan 17, 2018 at 4:04 AM, Jake <<a href="mailto:jake@spaz.org" target="_blank">jake@spaz.org</a>> wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
If someone gets the resistor shaved to fit in there, i'll bring in the<br>
special two-part thermal bonding epoxy and glue it in, and then i'll hook up<br>
the wires and we'll have a 3D printer again.<br>
</blockquote>
<br>
Don't glue it in place with epoxy, or you'll have to drill it out when it<br>
burns out again. It should be a tight enough fit to hold in place by itself,<br>
no? I would expect regular thermal paste to conducts heat better than the<br>
epoxy anyway...<br>
<br>
Patrik<br>
<br>
PS: the replacement resistor that Lulzbot sells is only $3.50, and I would<br>
expect that one to fit the hole like a glove. They seem to be out of stock<br>
right now though...<br>
</blockquote>
</div></div></blockquote></div><br></div>
</div></div></blockquote></div><br></div>