Printer nozzle/heater insulation?

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hoek67
Posts: 29
Joined: Tue Oct 13, 2015 11:09 pm

Printer nozzle/heater insulation?

Post by hoek67 » Tue Jul 19, 2016 2:02 am

Just wondering if anyone using an UP 2 Plus or similar has tried to insulate the nozzle assembly to improve stability/efficiency of the nozzle heater and to stop radiant heat heating up the stepper that feeds the filament?

Something like http://www.ebay.com.au/itm/10pc-2-5mm-t ... SwnH1WZtmj

Image

I've been revising my print head mod and have actually rotated the nozzle assembly 180 degrees so the fatter part of the nozzle sticks more to the left side rather than the right. Reason being where it was allows radiant heat from it to heat up the stepper a lot more. I had a good look at the assembly and feel if insulation is put around the part that gets heated a lot less heat will be transferred to the stepper and cooling will not be as much of an issue.

The parts that get hot seem to be thermally unconnected to the stepper so the transfer of heat must be radiant given the short distance.

The mod stopped enough heat to the point I could touch the stepper after a 10 hour job where originally I would have burnt my finger in doing so.

Will end up buying some of these to try and see how they effect nozzle heating time and temperature stability.

arhi
Posts: 256
Joined: Sun Mar 08, 2015 10:51 pm

Re: Printer nozzle/heater insulation?

Post by arhi » Tue Jul 19, 2016 10:42 am

I was thinking about it but didn't find any material I was happy with.. discussed with the inventor of the hexagon hot end as they have that black "rubber" insulator on the heater block and he told me they spent a lot of time finding that material it's some super special carbon filled blah blah blah ... and that regular insulators they tried fail quickly .. I then modified a bit (insignificant for normal use, I juse made some hole and mounting screws for another box) some thingiverse objects and glued some memory coolers on to stepper and now it works like a charm :D ... you can try yourself

http://www.thingiverse.com/thing:253687
http://www.thingiverse.com/thing:253694
http://www.thingiverse.com/thing:390993
http://www.thingiverse.com/thing:413198

if you end up trying that cotton insulation pads, please share your findings !!

hoek67
Posts: 29
Joined: Tue Oct 13, 2015 11:09 pm

Re: Printer nozzle/heater insulation?

Post by hoek67 » Tue Jul 19, 2016 12:45 pm

I'll post my findings when I get my hands on the insulation.

The small problem I have now is because the position of the heating element has swapped it's under the heat sink and the radiant heat now heats up the heat sink.

I might see how much a replacement one is and try without the sink as the fan and re-positioning were cutting the heat a lot.

I might look up the use of plaster as off memory it sticks, can be moulded easily, hardens when dried and is a good insulator. :?

arhi
Posts: 256
Joined: Sun Mar 08, 2015 10:51 pm

Re: Printer nozzle/heater insulation?

Post by arhi » Tue Jul 19, 2016 1:04 pm

i tried plaster and gave up 5-6 years ago (not related to UP!) ... I had good experience with silicone for car repair (good for up to 700C) combined with baking paper .. but baking paper is good up to 240C so I replaced it later with glass mesh, so a layer of car repair silicon (used to repair stuff around exost pipe, and gaskets on motor and stuff like that, there's red and green one, one is good up to 300C other up to 700C, your car repair shop should have it) .... anyhow layer of 0.5-1mm silicone directly on the nozzle, then few layers of glass mesh (you stop when it's not adhering any more to the silicone), then new 0.5-1mm silicone etc etc .. I had my nozzle use waaaaaaaaaaay less power (like 80% less!!) to heat up and keep on the temperature... and also the temp of the plastic exiting the nozzle was +-1C consistant during extrusion compared to +-7C without it... (ok the design of the nozzle was bit crappy but I was fixing a nozzle someone else made) ... also while nozzle was running 240C the outside of the nozzle was "touchable", between 50 and 60C .. so I was very happy with it .. I think I have pictures somewhere, at least the one with the baking paper ...

the only issue with this methond is when you need to "service" your hot end you need to cut off the silicone away and you have to reapply new one from scratch, no way to reuse it ..

(can't find picture .. here's one with that nozzle attached to mendel but you can't see the nozzle very good: https://picasaweb.google.com/lh/photo/h ... directlink )

hoek67
Posts: 29
Joined: Tue Oct 13, 2015 11:09 pm

Re: Printer nozzle/heater insulation?

Post by hoek67 » Tue Jul 19, 2016 1:37 pm

Was looking around and found another forum with a lot of results and discussion.

The car gasket silicone with rating > 700C seems quite viable.

From what I can tell, the results if done correctly are worth it.

http://forums.reprap.org/read.php?262,211788

arhi
Posts: 256
Joined: Sun Mar 08, 2015 10:51 pm

Re: Printer nozzle/heater insulation?

Post by arhi » Tue Jul 19, 2016 3:20 pm

hoek67 wrote: The car gasket silicone with rating > 700C seems quite viable.
From what I can tell, the results if done correctly are worth it.
yes that's the one I'm using for many years ... never see a need for it with UP! but I use it on my other printers

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