I am a newbie to 3D printing and I am making a 3D printer from scratch (Cartesian). I've got a RAMPS 1.4 shield and an Arduino Mega 2560 board. I have a few questions and it would be very nice if I can get answers.
The onboard MOSFET (STP55NFO6L) for the heatbed is dead and I think that the reason is because of the high resistance of my heat bed (1.8 Ω).
I have searched a lot and I am fully confused about what to do.
I am thinking of buying an external MOSFET and wire it up with the RAMPS fan MOSFET (STP55NF06L) and use the same heat bed.
Buy an external MOSFET and replace the onboard MOSFET (dead one) with the fan MOSFET (because of the underlying 11 A circuit) and use same heatbed.
Same as 2., but buying a new heatbed also.
Buying a RAMPS 1.6 and use old heatbed.
I am totally confused because of lot of searching. Please anybody help me. What should I do?