DEED 3D is the largest platinum partner of  ” Stratasys ”  in Asia, with more than 17 years of leading 3D printing technology and services.

Do you know 3d printing world are amazing? Two technologies from Stratasys are Fused Deposition Modeling(FDM) and PolyJet, each has different performance.

How can you find the suitable technology for your parts? Now let’s find how these two different technologies work.

FDM use thermoplastic filament materials, the filament will be melted down and extruded from a spray-head. When extruded into a bead, the material is immediately set in the high temperatures of the machine and layered on a platform. The spray-head repeats the extruding and melting, layer by layer until the part is complete.

The PolyJet is similar to the ink-jet printing, but it is not jet the ink on the paper. It use a carriage to jet the photosensitive resin liquid to the platform, which are cured by a UV light. After a thin layer is created, the process repeats itself by jetting additional layers until the part is fully formed.

Since materials and printing progress are different, the performance of the parts are different. There are some key things to consider when choosing the suitable technology:

1. Application

What’s the parts final application? PolyJet perfect for create parts with small structure with many details. Makes it a great choice for concept models with many details shown. 

But need to notice is that FDM also has its great performance with durable end-used parts.that are ready for end-use applications. If fit and function are critical to your part, FDM may be the best choice.

2. Material

It is also important to consider what you are concerned about the most of the parts.

If you are pay attention to the small details, PolyJet are suitable to show the small features. PolyJet also can print flexible parts like rubber-like with different hardness.

When printing in FDM,  there are many different thermoplastics that can used, the heat deflection temperature, chemicals resistance, hardness need to be consideration.

3. Aesthetics/Surface Finish

It’s crucial to concern about the surface finished and aesthetics when printing a larger parts as well as concept modeling and some prototypes. If this is the case, PolyJet use of multiple materials to show the detail is a good option. Compare to the PolyJet, FDM will have layer lines on parts, but these lines usually do not affect a part’s strength or functionality. 

4. Part Size

The size of your part also needs to be considered when choosing the printing technology. Both PolyJet and FDM perform the similar dimensions, but the maximum part size are different:

PolyJet max printing size is 500*400*200 mm 

FDM max printing size is 914*610*914 mm 

Fortunately, you don’t need to worry about if your parts are over sizes. We can print them separately then use epoxy to glue them together, giving it the strength and functionality as the complete part. 

Both technologies have their advantages and limitations. If you are looking for high-resolution with many detail shown, PolyJet is a great option. However, if durability and end-use function in extreme conditions are important to you, FDM is your better choice.

So there is not the best printing technology, but the most suitable one.

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