Round holes in parts that are perpendicular to the build plate typically do not need support material. Is this statement true or false?

The statement that round holes in parts that are perpendicular to the build plate typically do not need support material is accurate. When a hole is oriented perpendicularly to the build plate, the overhang is minimal, as the walls of the hole can be built directly upon the plate without requiring additional support.

This setup is advantageous in additive manufacturing because it allows for clean, efficient printing and helps maintain the integrity of the surface finish within the hole. The additive manufacturing process relies on layer-by-layer construction, and in this case, each layer can directly contribute to the formation of the hole, as the previous and subsequent layers do not create unsupported spans.

However, it is important to consider that in some specific cases, such as larger diameter holes or certain geometrical configurations, minor overhangs may still occur, which could potentially lead to the need for additional support. Nonetheless, in general, provided the hole is suitably sized and positioned, the lack of support material is a standard practice for holes aligned in this manner.