class CircleClip : Model {

    @Custom( about="Diameter, width, thickness" )
    var size = Vector3( 25, 3, 2 )
    
    override fun build() : Shape3d {
        val circle = Circle( size.x / 2 )
        val ring = circle.offset( size.y ) - circle
        val splitRing = ring - Square( size.x, 1 ).centerY()

        return splitRing.extrude( size.z )
    }
}