Does anyone know of a generally-available heat sink that will fit on the motor controllers on a Melzi board (the kind that comes with a RepRapPro Mendel Tricolour)? I've tried adjusting the potentiometers, but I can't seem to get more than 2-3 prints before I get layer shifting. I've tried blowing a fan on the board, but I'm not sure how well it's working, and it's cooling down the heated bed when I need it to get hot.
