Material Jetting (MJ)

image of Explanation of the technology material jetting including characteristics, materials, machines, vendors, applications and process chain. image of Explanation of the technology material jetting including characteristics, materials, machines, vendors, applications and process chain.

Synonyms

Multijet modeling, DOD, drop on demand, Thermojet, Inkjet printing

Process description

Inkjet print heads are used to jet melted wax materials onto a build platform. The material cools and solidifies which allows to build layers on top of each other. Read more

Material jetting machines utilize inkjet print heads to jet melted materials, which then cool and solidify. By adding layer on layer, the part is built. Wax materials are used with this technology. Material jetting requires support structures for overhangs, which is usually built in a different material.

Advantages / disadvantages

Material jetting can achieve very good accuracy and surface finishes. However the technology only works with wax-like materials. Read more

The technology can achieve very good accuracy and surface finishes.

There is only a limited number of wax-like materials available for material jetting. Due to the type of material, parts are rather fragile. The build process is rather slow.

Application areas

  • Prototypes are built by material jetting which are used for visual and form / fit testing.
  • Casting patterns are produced with very good accuracy and surface finishes. Especially in the medical, dental and jewellery industry they are often used for lost wax casting.

Characteristics / restrictions

  • Maximal build envelope: 300 x 185 x 200 mm3
  • Minimum feature size: 0.1 mm
  • Typical tolerance: +/-0.025 mm
  • Minimum layer thickness: 0.013 mm

Characteristics are only indicative, as there are different types of machines available.

Process chain

After the build, support structures are either mechanically removed or melted away. Often, material jetting parts are then used as patterns for casting. Read more

Pre-build planning

The production of parts is planned in a build preparation software. One or several parts are loaded from digital 3D files (typically in the STL file format). These can be arranged to fill the entire volume of the build envelope.


Post-processing

  • Remove of support material: Support material are either mechanically removed or melted away.
  • Casting: Parts are often used as patterns for lost wax casting

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