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Themistor of the bed plate

Posted: Thu Aug 25, 2016 11:07 am
by Khayrisill
I have a question about this thermistor.
Yesterday i set up the thermistor on the hole in the middle of the plate with RTV. I did not pay attention to the beginning but now we can see the thermistor through the RTV when you flip the plate. I don't know if it's a big deal if there is no RTV on it.

Thx.

Re: Themistor of the bed plate

Posted: Thu Aug 25, 2016 1:58 pm
by Qdeathstar
Kind of, because when you print the plastic will stick to the thermistor and you might/will pull of the Thermistor when you are pulling off your print... You can put some more rtv on the topic...

Re: Themistor of the bed plate

Posted: Thu Aug 25, 2016 2:06 pm
by Khayrisill
Hi,
But i have a glass plate to put on top off the bed. Right ?

Re: Themistor of the bed plate

Posted: Thu Aug 25, 2016 2:13 pm
by Qdeathstar
Oh, yea.. Brain fart.. I'd still full in the area with rtv... Might affect temp readings...

Re: Themistor of the bed plate

Posted: Thu Aug 25, 2016 2:23 pm
by Khayrisill
ok, so i 'll try to add some, but the hole it's already full. i think i push to much on the thermistor...

Re: Themistor of the bed plate

Posted: Thu Aug 25, 2016 2:27 pm
by Qdeathstar
It isn't a huge deal... The hotend is where the rtv is really important...

Re: Themistor of the bed plate

Posted: Thu Aug 25, 2016 4:45 pm
by Xenocrates
If the hole is full, and the thermistor is showing, then I wouldn't worry about more RTV. I might add a dab of a non-conductive thermal paste, such as Ceramique or Arctic Silver 5 (Most pastes are non-conductive these days, and it's only really an issue if there's a way for it to get to the leads of the thermistor) before clipping on a heatspreader. If you don't plan to buy or make a heat spreader, take 2-3 sheets of heavy duty aluminum foil, and put that down under the glass.

If you put the aluminum foil down, it will do the nameplate job of a heat spreader, but won't provide thermal mass to reduce oscillations. And the best part is, if you don't already have some foil and paste on hand it should be a cheap upgrade that produces more consistent prints over the whole bed.

Re: Themistor of the bed plate

Posted: Fri Aug 26, 2016 2:10 pm
by Khayrisill
Thanks for the tips Xenocrates ! I have finally restarted correctly the installation of the thermistor.