What Is 3D Printing (3DP) and What Are Its Advantages and Limitations?
The three-dimensional printing process, also known as 3DP, was developed by Emanuel Sachs and his team at the Massachusetts Institute of Technology. It was later commercialized by Soligen Corporation in the United States under the name DSPC, or Direct Shell Production Casting, for the manufacture of ceramic shells and cores used in casting applications.
The 3DP process is similar in some ways to selective laser sintering because it also uses powder-based materials such as ceramic powders and metal powders. However, the main difference is that 3DP does not join the powder by laser sintering. Instead, a printhead selectively deposits a binder, such as a silica-based adhesive, onto the powder bed to form the cross-sectional shape of the part layer by layer.
At the beginning of the 3DP process, powder material is supplied from the powder storage system to the build area. A roller spreads a thin and even layer of powder across the work platform. The printhead then moves over the powder layer and deposits binder only where the part cross section needs to be formed. After one layer is completed, a new layer of powder is spread, and the process is repeated until the full part is built.
Advantages of the 3DP process
(1) Fast forming speed
The 3DP process is known for its relatively fast build speed compared with many other additive manufacturing methods.
(2) Suitable for complex shapes
It is well suited for manufacturing parts with complex geometry and intricate internal or external features.
(3) Capable of producing composite or non-uniform material structures
The process can be used to manufacture parts with composite materials or non-uniform material distribution in certain applications.
(4) Suitable for small-batch production
Because it does not require traditional tooling, 3DP is suitable for prototype development and small-batch part manufacturing.
(5) Clean and flexible digital manufacturing
The process supports a relatively clean and flexible digital production environment and is often considered suitable for office-style design and prototyping work.
Disadvantages of the 3DP process
(1) Limited accuracy and poor surface roughness
Compared with some other rapid prototyping methods, parts produced by 3DP may have lower dimensional accuracy and relatively poor surface finish.
(2) Part variability and risk of cracking
The finished parts may show variability in quality, and in some cases cracking may occur depending on the material system and post-processing conditions.
Overall, 3DP is a fast and flexible powder-based additive manufacturing technology that is especially useful for complex shapes, casting-related applications, and small-batch production, although its precision and part strength limitations should be considered in practical use.