Crud! Sorry to hear that. I hadn't read this post before but would have chimed in that, without the heated bed, Your setup will use less than 5A and I think most of that goes to the steppers. No real reason to relay out the hot end.

BTW, I caught my first heated bed on fire messing with a relay. Turns out I tried to put an AC version on instead of a DC. Was a beautiful stream of yellow smoke. Stunk up the house something crazy!