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Heated Bed at 37C?

Posted by Kyle R 
Heated Bed at 37C?
May 28, 2014 07:43PM
Hi Everyone,

I'm building a bioprinter for cell deposition using reprap as a launch point. Is it possible to use a heated build platform sold for ABS printing which gets very hot and maintain a lower, physiologic temperature around 37C (98.6F)?
Re: Heated Bed at 37C?
May 28, 2014 10:07PM
you could increase the resistance of the circuit so it doesn't get so hot.
Re: Heated Bed at 37C?
May 29, 2014 07:07AM
The heated bed has a thermistor, and both PID and bang-bang heated bed temperature control is built into most firmware. If your needs are super-precise (say 0.2C maximum fluctuation across the bed surface), you may want to investigate aluminum heat spreaders as the PCB bed themselves seem to have cold spots as you move away from the center.....
Re: Heated Bed at 37C?
May 29, 2014 10:00AM
You can reduce the maximum power in software as well. Reduce MAX_BED_POWER in Marlin at https://github.com/ErikZalm/Marlin/blob/Marlin_v1/Marlin/Configuration.h#L223

I think you'll need some reduction to make the heating response curve match the cooling response curve better around 37C so that the PID controller isn't adversely affected by the asymmetry. IOW, if it takes 180 seconds to cool from 37C to 30C, then the heating should be similarly slow.
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