In the last century, the earliest prototype is made by sla rapid prototyping technology in western country. Without CNC machining at that time, the material is type of resin, not stiff enough. But as sla model, it helped many designers and investors to save so much cost and time in early stage of product development.
With industry continually development, sla prototype service is more and more popular. In fact, 3D printing innovation is built based on sla technology. So we can say, without sla, without 3D printing technology. Today the material is not limited for printing. Because this technology been applied in many fields. Printing food, printing ceramics, it makes people’s life more colorful.