The 3D printing method known as Multi Jet Modeling (MJM) involves layers of photopolymer being placed on top of each other and cured with the help of UV light. This method is also widely known as the Inkjet or Polyjet method. During the printing process, the 3D object is built up layer by layer by means of a print head. Multi Jet Modeling makes it possible to make objects that are rich in detail and have a smooth surface. It is comparable to a conventional inkjet printer in the way it works. At least two print heads are used for printing so that additional supporting elements can be built in. As a result, overhangs on the object can be created without problem. The layers of the object are gradually added, whereby building and supporting materials are used alternately. The supporting material, which surrounds the model during the printing process, is completely removed when the component goes through further processes at a later time. The supporting material is either removed with a jet of water or it can be dissolved in water. A photopolymer is used as the material and is cured through exposure to UV light. The disadvantage of photopolymers is that their strength changes over time as the UV light contained in sunlight eventually changes the material.
Due to the layering method, diverse components can be built inside each other even during the printing process. It is irrelevant whether the materials differ from each other aesthetically, physically or haptically. The advantage of Multi Jet Modeling is that, depending on the equipment used, different materials can be mixed in the nozzle so that completely different colour shades or degrees of hardness can be achieved for components, which can be later painted, cut or ground in the finishing process.
The Multi Jet Modeling method is perfect for branches of industry in which the objects have to be designed in great detail:
- Prototype construction
- Models with thin walls
- Model making
- Precise mould and casting templates
- Models with a delicate design