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What is Binder Jetting?

Posted on Apr 03, 2020 by Cullen Hikene

Binder jetting is a 3D Printing process that involves building the layers of a part by selectively applying an adhesive to a powder bed. The powder bed then descends one layer in height, followed by a roll of fresh powder evenly spread on a new layer over the part. After the shape of the part is printed, the part (now in the green state) will typically undergo some sort of post-processing to make it stronger, commonly being baked in a kiln. The metal, gypsum, or ceramic powder binds to itself to form a superior integral bond.

Certain printers—color jet printers—can apply colored adhesive. This provides the opportunity to print in full color, suiting visual models and colorful, non-functional parts with complex geometries.

For more functional projects, binder jetting can offer the production of large sand casting cores and molds, and the overall manufacturing of low-cost 3D printed metal parts.

What are the Different Types of Binder Jetting?

  1. Binder Jetting (Metal, Full Sinter)
  2. Binder Jetting
  3. Binder Jetting (Sand)
  4. Binder Jetting (Gypsum)

What are the Advantages of Binder Jetting?

  • Full-Color Prints. CJP jetting machines can print in the full-color spectrum.
  • Relatively Affordable. A cost-effective technology for gypsum or metal prints.
  • Material Conservation. Powder can be reused for later prints.

What are the Limitations of Binder Jetting?

  • Multiple Steps. Jetting and post-processing can extend the time needed to create the design.
  • Simple Geometry. A challenging post-process makes small features and complex designs more difficult to achieve than with other powder bed processes.
  • Low Durability in Green State. Without a post-processing step, parts are highly anisotropic and typically fragile in the Z direction. Solutions include dipping it in acrylate for gypsum parts or fully sintering for metal parts.

 

Key Metrics

Standard Tolerance
+/- 3%

Stock Surface Finish
~400 µin Ra

Lead Time
3-10 Business Days

Maximum Size
24″×24″×24″

Minimum Layer Thickness
0.004″ (0.100mm)

Minimum Feature Size
0.02″ (0.50mm)

Minimum Wall Thickness
0.04″ (1mm)

Conclusion

Binder jetting is an emerging technology in the 3D Printing space gaining popularity due to its high fidelity, durable part creation. Consider submitting an RFQ through manufacturing services such as ProdEX to get started today.

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