The model shown in this particular example consists some areas with negative draft angle, which usually require a large and expensive 5-axis CNC-milling machine. However, there is an easy solution to achieve that with a basic 3-axis CNC-milling machine, in order to reduce the overall manufacturing cost. It only requires to divide the model into several pieces in a clever way, so that the negative draft angle area (located in the smaller of the three pieces) is CNC-milled from top side and then assembled pointing towards the side. This technique makes it possible to produce such a complex model with nearly any 3-axis CNC-milling machine available on the market.
