Fun new problem: I got the heatbed in last night and measured the resistance, and it's .4 ohms! At 12V, that's 30A/360W, which exactly what my power supply is rated for. Which means I need to add an additional power supply to power the board, steppers, hotend, etc. or find a more powerful power supply.
Edit: went ahead and ordered a ATX PSU that's 480W and can deliver 40A on the 12V rail, which I'll convert. Just need to return the old power supply.
Edit: went ahead and ordered a ATX PSU that's 480W and can deliver 40A on the 12V rail, which I'll convert. Just need to return the old power supply.