My printer (Prusa i3 Mk3 rework clone, with a 200 x 200 MK3 ALU-heatbed, RAMPS 1.4) has a car relay for heated bed control. It works just fine using bang-bang on Marlin, but I would like to replace it with a MOSFET anyways. The specialized MOSFET heating modules are way too expensive in my country, so I was thinking about buying a MOSFET that's good enough to handle my 12 V 10 A bed with Marlin's PWM.
Would a MOSFET like the STP80NF70 be enough (0.01 Ω at vgs 10 V, 68 V 100 A) or would one of the bigger ones, e.g. in TO-3P encapsulation be needed?
It would go in a proper heatsink and ran at 12 V with an optocoupler