What is the best method for removing PVA support material from a finished part?

The best method for removing PVA (polyvinyl alcohol) support material from a finished part is through a tank of tap water that has a moving flow. PVA is a soluble support material used in 3D printing, particularly for parts that have complex geometries where traditional support structures might be difficult to remove.

When PVA is submerged in water, it begins to dissolve, and the moving flow helps to accelerate this process by continuously replacing the water surrounding the part with fresh water. This flow increases the efficiency of the dissolution, ensuring that any PVA that has begun to dissolve is quickly washed away, preventing any residue from adhering to the part.

Using a knife or a heat gun is not suitable for removing PVA support. A knife could damage the part or leave behind bits of support material. A heat gun, while effective for some materials, does not aid in dissolving PVA and could potentially deform or damage the printed part, especially if it is made from materials sensitive to heat.

Therefore, employing a tank of tap water with a moving flow is the most effective and safest method for removing PVA support material, ensuring a clean finish on the 3D printed part.