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Bed doesn't heat without lamp over it

Posted by budrow01 
Bed doesn't heat without lamp over it
March 28, 2016 07:16AM
The bed on my prusa i3 doesn't hold it's temp at 110 degrees C once the print has started. I have a reading lamp over it while heating up to help it heat faster but when I take it off the temp starts to drop. It can't hold it's temp without help from a reading lamp. I can't have it over the bed during the print because it would hit and bump into the print. The bed hovers around 90 degrees but doesn't stay at the target 110. Thanks
kr_
Re: Bed doesn't heat without lamp over it
March 28, 2016 01:24PM
You may need some sort of thermal insulation under the bed. You can use a cork sheet.
Re: Bed doesn't heat without lamp over it
March 28, 2016 01:41PM
Is the bed getting the full voltage and it's insulated underneath?
Re: Bed doesn't heat without lamp over it
March 29, 2016 01:10PM
It's getting the full 12 volts
Re: Bed doesn't heat without lamp over it
March 29, 2016 01:13PM
You know how it has 3 inputs and it says for 12 volts port 1 needs to be positive and 2 and 3 need to be negative. I did all of that and checked it. No, it isn't insulated.
Re: Bed doesn't heat without lamp over it
March 29, 2016 01:14PM
Cork sheet seems to be pretty expensive.
Re: Bed doesn't heat without lamp over it
March 29, 2016 01:15PM
I'm also having bad warping issues.
Re: Bed doesn't heat without lamp over it
March 29, 2016 02:52PM
I'm using fiberglass based pipe wrap to insulate under my heat beds.
Re: Bed doesn't heat without lamp over it
March 29, 2016 06:48PM
Sorry, just looked at one listing. It's not that expensive.
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