MK6+ RTV insulation
by MTO, published
Description
I tried again. When the first attempt failed, I peeled off all the RTV and it turned out I had put about 1/16 inch of insulation on it... I redid it, this time making sure I applied it thicker. I also did about 3 passes. I have much closer to a quarter inch of RTV on it, and its printing well. As I type this, I've been printing for 1 hour, 23 minutes without the shutoff kicking in, and the M3s through the acrylic are not too hot to touch. Neither is the RTV.
*update*
So far, so bad. It really didn't insulate enough. My ToM heated up and ran for a few minutes (maybe 10) before the safety shut-off cut out. Its weird because it seemed to me that the insulation itself wasn't too hot. To my finger, it was cooler than the extrusion tip. Looks like I need more, or a different silicone, assuming it can be done with silicone at all.
*end update*
I started building the new hot end, and decided I didn't like the insulation. its the least professional bit, imho. So I went looking for an alternative. This is my first try: RTV. Its good up to 370C and vulcanizes, as it sets, in 24 hours.
Ok, so it doesn't look any better, but its mine, ya know?
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I'll have to go look at that.
I used http://www.permatex.com/produc...
It was 7 bucks at CanadianTire (more than just tires!)...
RTV (oh! Room Temperature Vulcanizing)... like this stuff? http://www.mgchemicals.com/pro... http://www.ides.com/info/plast...
Which did you use?
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Instructions
remove the heater and replace its bolt.
remove the mounting plate and bolts.
wash everything with acetone.
Replace the mounting bolts minus the plate (its in your way)
Carefully cover the whole thing in RTV.
Carefully remove the mounting bolts and wipe excess goo off them.
At this point, I tried to use the mounting plate as a squeegee to spread and even out the RTV... not so effective.
Replace mounting bolts and plate.
Put the thing down upside down somewhere and let it set a few hours.
With a sharp knife, trim out the thermocouple washer, the heater retaining bolt, the mounting bolts and if you're up for it, the nozzle.
take blurry photos and post your efforts on thingiverse.
wait 24 hours.
Cover it in more RTV
wait 24 hours
Cover it in more RTV
wait 24 hours
try.
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I heard Zoltek Pyron works well!
http://www.homedepot.com/webap...
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I am already using it for insulation under my heater PCB on my HBP in my Thing-O-Matic.
I agree with the sentiment, I thought about designing a cover and having it printed in ceramic. *DONT_KNOW*
Maybe, you could print a mould fill it with RTV and remove the mould when the RTV has set to make a removable heat resistant cover ?
I think yours is an improvement over the tape. :)
Thanks!
I think I've got about an eighth of an inch of rtv on this beast. I'm gonna run it tomorrow and see how hot it is to the touch, but I think should have gone for closer to a quarter inch of rtv...
i think printing a mould is the right way to go. I've never done casting, but I have a sculptor frien
d offering to help, and i am sure those results will look better. getting a thick coat will be easier too. I just need to return to printing to make moulds...
RTV (oh! Room Temperature Vulcanizing)... like this stuff? http://www.mgchemicals.com/pro... http://www.ides.com/info/plast...
Which did you use?
I used http://www.permatex.com/produc...
It was 7 bucks at CanadianTire (more than just tires!)...