Function lip 

pub fn lip(
    part: &mut NamedModel,
    namer: &Namer,
    operation_id: &str,
    face: FaceId,
    edges: &[EdgeId],
    size: LipSize,
) -> GeopResult<()>

Raises a lip along the edges edges of the rim face face (see the module docs), joined to its solid, for the operation operation_id whose names namer builds: the result is named namer’s root, the lip’s faces along an edge E N(E) (on the wall) and N(E,far) (inside the rim), its top N(end).