The goal of this project is to fit the DRV8818 circuit onto the standard 0.8" X 0.6" PCB size used in RAMPS 3D printers. Power dissipation is expected to be in the range of 2-5 watts, so a good heatsink is crucial.
Blog: https://hackaday.io/project/28197-drv8818-stepper-driver-module-for-3d-printers