class CanLid : AbstractModel() {

    @Custom( about = "The external diameter of the can's lip" )
    // Which is the internal diameter of this part (excluding the clip)
    // 53.8 for aluminum drink cans.
    // 74.5 for steel food tins
    var innerD = 53.8

    // I've commented out the remaining "@Custom" lines, because I only want to change the diameter.

    //@Custom( about= "The thickness of the edges" )
    var thickness = 3.0

    //@Custom( about= "Thickness of the base" )
    var baseT = 1.2

    //@Custom( about= "The height of the can's lip" )
    var lipH = 2.2

    //@Custom( about="The height of the chamfered edge which clips onto the can" )
    var clipH = 0.8

    var extraHeight = 2.6

    override fun build() : Shape3d {

        val profile = PolygonBuilder().apply {
            moveTo( 0,0 )
            lineTo( innerD/2 + thickness, 0 )
            lineTo( innerD/2 + thickness, baseT + extraHeight + lipH + clipH*2 )
            lineTo( innerD/2, baseT + extraHeight + lipH + clipH*2 )
            lineTo( innerD/2 - clipH,  baseT + extraHeight+ lipH + clipH )
            lineTo( innerD/2, baseT + lipH )
            lineTo( innerD/2, baseT )
            lineTo( 0, baseT )
        }.build()
            .roundCorner(1,0.4,1) // Add a tiny chamfer and "fix" elephants foot.

        return profile.revolve()
    }

}