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PCB Design Rules

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Initially PCBs were designed manually by creating a photomask on a clear mylar sheet, usually at two or four times the true size. Starting from the schematic diagram the component pin pads were laid out on the mylar and then traces were routed to connect the pads. If you have many questions of PCB Design, please come here!

Community > Groups > PCB Design Rules > Can I use an internal layer as a heat bed if I want to warm my multilayer pcb?
Can I use an internal layer as a heat bed if I want to warm my multilayer pcb?
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Turchi Leonardo

Is it proper to use the internal layer as a heat bed? If not, any disadvantage?
Statement: This post is only the personal view of the author and does not represent the opinions of


You can not take away any copper that you don't need for heating, that'll help a lot, and if you can connect those to a safe ground trace or plane: First of all that will conduct the heat away to that plane, which helps, but it also avoids resonances and such when you start PWM-ing the heater.


You can shield electrostatically with a ground plane, but the magnetic field will go right through everything, so if you have sensitive circuits you might need to filter the PWM to something more like DC.

Simone Briatore

I'd use a cheap SMT thermistor for the sensor assuming you only want to control at one temperature. Just stick it in and it will work.

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