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Re: Dual power supply (relay?)

Mean Well power supplies like the one you linked have trimpots next to the output terminals to adjust the voltage. The spec sheet says that the SE-350-12 can be cranked up to 13.5V, which may make a difference. The big question is how your RAMPS board will handle the higher voltages. I don't use one, but have heard that there's concerns if your voltage exceeds +12.00001 volts. If you can get a stable +12V out of your ATX power supply, you could run the +12V to your RAMPS from that but feed power to the heatbed from the Mean Well SE-350-12 through your relay with the voltage cranked up. (Be careful with the trimpot, they are fragile.)

My SeeMeCNC Onyx 300mm diameter heatbed has about the same power draw/curve as the MakerFarm one you linked above. When I was running it from 12V, I had to throw a magazine over the glass and wait 30-40 minutes while it struggled to reach 110C. I bought a Mean Well SE-600-24 (24V, 600W) power supply, and turned it down to 19.5V on the trimpot. I was already using an external SSR and heat sink, so this power supply drives the bed at 19.5V. To power my 32-bit controller board, I picked up a 24V->12V buck converter from Amazon:

http://www.amazon.com/gp/product/B00BWKXTUU/

The net result is that my heated bed is running from 19.5V, the controller is being fed a regulated 12V with enough overhead to run triple extruders if I wanted to, and I only need one power plug to a wall outlet. Granted, my wallet is $120 lighter, but you can't put a price on a heatbed that goes from 20C->110C in 6 minutes without insulation and has no problem holding (or even overshooting) 110C.....

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