What type of support material is best suited for complex internal geometries in FDM prints that require complete removal?

For complex internal geometries in FDM (Fused Deposition Modeling) prints that require complete removal of support material, a soluble support material is best suited. Soluble support materials are designed to dissolve in a specific solvent without affecting the primary printing material. This allows for the complete removal of support structures from intricate internal cavities and overhangs that would be difficult or impossible to reach with manual removal methods. PVA (Polyvinyl Alcohol) is a common soluble support material that dissolves in water, making it suitable for use with PLA (Polylactic Acid). HIPS (High Impact Polystyrene) is another soluble option that dissolves in limonene, often paired with ABS (Acrylonitrile Butadiene Styrene). The choice of soluble support material depends on its compatibility with the primary printing material; it must adhere well during printing but dissolve completely without damaging the finished part. Using soluble supports eliminates the risk of damaging delicate internal features during manual support removal and provides a clean, professional finish for complex prints.