What are important DFM considerations for casting design?

Casting DFM guidelines include: maintaining uniform wall thickness to prevent shrinkage porosity, adding draft angles (typically 1-3 degrees) for pattern removal, using generous fillet radii at junctions to aid metal flow and reduce stress concentration, designing parting lines in non-critical areas, minimizing undercuts requiring cores, ensuring adequate metal feed paths to thick sections, and placing machining allowances on critical surfaces. Consider shrinkage allowance specific to the material.