These products are assembled on a wheelchair. This is a new design of wheelchair of the customer, prototyping is required in the early stage to confirm the final effect. For this type of product, there is a high chance of changing the design after prototyping. At this time, it is most appropriate to use precision CNC manufacturing these products. It has the best effect and the highest efficiency, it is also the easiest to adapt to changes caused by product design changes. We only need to change the CNC machining program to easily get the latest design of the product. Unlike investment casting or die casting, which require the modification of the mold to re-produce the latest product, the flexibility is also better than investment casting or die casting, which require molds to produce products.