What are the disadvantages of "rapid prototyping" compared with "machining"

1, material. There are so many materials for machining, but few materials for SLS rapid prototyping have been developed. Although many materials have been developed, some materials are not used much, so they are not used much. SLA can only use photosensitive resin.

2. Price. High material cost leads to high cost of rapid prototyping, but it is not absolute. CNC machining of some complex parts may be more expensive than rapid prototyping.

I won't list the advantages one by one, there are too many.

Rapid prototyping only needs 3D data model, no engineering drawing, no process, no programming, no tools, no mold, and it can be done in a few hours by throwing it into the equipment, so the cycle is short, manpower is saved, and the development cost is definitely reduced. Another great advantage is that the design thinking of engineers is no longer limited by the traditional processing technology, and the design thinking is more open.