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Imagine the excitement when a wire carrying line voltage frays and shorts to something else in the braided sheath!
Instead, use the RAMBo's MOSFET to control an off-board DC-DC solid state relay, rewire the heater to run from a (somewhat) higher voltage external power brick, and tune for minimum smoke. I have a hotrod M2 platform, but the principle applies:
https://softsolder.com/2013/10/11/maker ... hermistor/
https://softsolder.com/2014/06/05/maker ... oah-powah/
When the wires fray, the result won't kill you.