The method of stacking and printing materials in layers is called the additive processing method (AM). 

There are various AM methods depending on the material and the molding technology.

In 3D printing, metal handling methods include PBF and DED methods that melt metal powders with high-power lasers, 

The BJ method is a method of bonding one by one with a binder and making it through a heat treatment process.

It's made by stacking it with ceramic materials and sintering it later.

There are many ways, but what we have in common is the concept of stacking.

If I summarize metal 3D printing into three categories, 

 1. Concept that contrasts with cutting processing that cuts or cuts materials.

 2. The degree of freedom in design is very high, increasing the efficiency of development and prototype production. 

 3. Specialized in producing high value-added products in small quantities of various varieties.

It is advantageous to manufacture precise parts.

The disadvantage is that it takes a long time to print and the metal powder has a small particle size and a high price.

It is suitable for high value-added products with a small amount of variety.

The DED method is a method of spraying and depositing powder with a high-pressure axis and melting it with a laser at the same time.

The speed is fast and the price of the powder is relatively low. You can add it to the existing shape to make it. 

It is good for maintenance of parts. It is difficult to make small and precise shapes.

It is not difficult to understand when you think of an inkjet printer by spraying a binder (bond) on a thin layer of powder material and depositing it. 

Since it is not a method of melting with a laser, there is little deformation due to thermal stress generated during the lamination process and the manufacturing speed is fast.

In the heat treatment process, the design shall be carried out in light of shrinkage, and complicated and difficult shapes shall be designed in consideration of shrinkage.

Shrinkage reinforcement design is required. Interpretation is very important.

There are also various other metal 3D printing methods.

Metal 3D printing has various processes depending on the material and purpose, so you have to find a way suitable for the purpose of use.

- If you need to make precise parts that are important in terms of dimensions, use PBF method.

- It's not precise, but if you need a certain amount, use desktop metal or BJ.

- If you need to maintain the damaged parts or add metal workpiece to a certain surface, the DED method.