Don't buy crap ramps board with cheap MOSFETs from china....
Infact replace the MOSFET on D8 imediatly no matter where you got the ramps from, as the standard MOSFET is not good enough for the job, it needs a heat sink and a fan on it.
Use any of the MOSFET replacments in the list below.
Best mosfets for driving your heated bed: IRLB3813, IRLB8743, FDP8870, AOT240L, CSD18502KCS. These mosfets will run merely warm with NO heatsink and a load current of 10A. They should be good to over 15A with no heatsink according to the worst-case numbers in their datasheets and is also [
reprap.org]
Edited 2 time(s). Last edit at 01/21/2015 02:52AM by Dust.