What Material Jetting isMaterial jetting is a process that combines 2D inkjet printing and stereolithography (SLA). The material, a photoreactive resin, is heated to obtain the needed viscosity for printing. Then, the print head moves horizontally and shoots hundreds of micro-droplets of material onto the build platform . This can be continuous or drop by drop process . These droplets form a layer that is solidified by cooling, UV-light curing, or by evaporating the liquid part of the material via an infrared laser . The build platform lowers as more material is deposited.
- The print head is positioned above the build platform. Material is deposited in droplets from the print head onto the surface.
- The droplets of material solidify, and this repeats until the model is complete.
- When the model is complete, the layers are cured by UV light.
In the liquid resins, there are UV photo-curable resins. The curing process is completed using UV rays. One of the most common build material for material jetting is polymers in the form of liquid resins . This is due to the advantage of using the UV photo-curable resins that do not need extra post-processing steps .
Materials include polymers in the form of liquid resins, plastics, and metal . Polymers include polypropylene, HDPE, PS, PMMA, PC, ABS, HIPS, EDP .
Equipment Used Today
Material jetting 3D printing technology has applications in making realistic prototypes. The process provides an excellent level of detail, high accuracy, and a smooth surface finish . Material jetting allows a designer to print a design in multiple colors and with a number of materials in a single print. 
Pros and Cons
- Each printhead can store a different colored material, allowing multi-material and multi-color parts to be used simultaneously 
- Very high accuracy 
- Smooth finishes 
- Low waste due to the deposition of droplets 
- High equipment cost 
- Support material is often required 
- UV activated photopolymers lose mechanical properties over time and can become brittle 
Video Demonstration of the Material Jetting Process
GrafEngin. (2016). material jetting. Available at: https://www.youtube.com/watch?v=m8n6FBKgY2g. (12/29/20).