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Temperature Controller for Heated Bed Plate?

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I am about to put together a heated bed plate for my Ultimaker and I am unsure how to control the temperature of the PCB for the bed Plate.

1. Should I connect to the Ultimaker with a relay?

2. Should I connect to an external controller? If so which type?

I have a 8.5" x 8.5" PCB Heatbed MK1, a 9.5" x 9.5" x 1/4" Aluminum Plate, a 9.5" x 9.5" x 3/16" piece of High temp Ceramic Glass, a Thermistor, a12v external Power Supply, and Ceramic Mill Board to insulate between the heated components and a acrylic plate to mount it to the z-stage, and Kapton Tape.

I am open to either way. I am just trying to figure out which way provides the best and safest connection for me and the Ultimaker.


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The nice thing about running HB through UM is that when the print finishes it automatically shuts off the HB. That's probably the only reason but it's a pretty good reason. If you start a print and then go out to lunch or go to sleep or get a phone call or whatever, it kills HB power when done so when you come back your print is ready to pop off the bed.


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