Mega 2560 and ramps1.4 set on a board, to solve complicated Ramps1.4 combination of interfaces, the problem of failure prone.
Replace the motor drive, drive and support 4988 8825 drive.
The circuit board with high-quality 4-layer, heat and made a special optimization; ramps are 2 shelves.
Using high-quality MOSFET, and better heat dissipation.
Using a dedicated power chip, support 12V-24V power input, the voltage converter chip to solve the heat problem Ramps.