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Overhang

Overhang paints the faces that lean out too far to print without support, while turning the part is still cheap.

Undersides of a T shaped part painted red beside the Overhang analysis panel

Pick Overhang under Inspect and red faces need support. Build dir is the direction your printer stacks layers and starts at +Z. Threshold is the angle past which a face counts as unsupported and starts at 45 degrees. Pick Overhang again to switch it off.