Binder Jetting

3D Printing Process

 

3Diligent's Binder Jetting Service is a cost effective option for full color models (Color Jet Printing) and for functional metal parts (Binder Jetting with Metal Infiltration).  If you've got a project that calls for Binder Jetting, submit an RFQ through our secure portal.  Have more questions about the process or our service?  Read on or email us with a description of your project needs and we'll be in touch to discuss further.

 

Process Overview

Binder jetting involves selectively ejecting a binding agent onto a powder bed. After a layer is finished, the powder bed will descend the height of one layer and a new layer of fresh powder will be evenly spread across the part. After the shape of the part is printed, the part (now in the green state) will undergo some sort of post processing to make it stronger, commonly baking in a kiln. As a powder bed based process, it is capable of printing downward facing surfaces with relative ease.

With Binder Jetting, an adhesive is selectively applied to a powder (typically gypsum or stainless steel, but materials like ceramics are being explored in academic settings) to form each layer. After the part is printed and depowdered, it is exposed to a permanent binder to make the part stronger. Certain binder jetting printers - Color Jet Printers - are capable of applying colored adhesive, which provides the opportunity to print in full color. This makes color jetting parts ideal for visual models and color nonfunctional parts with complex geometries.

Branded Processes (Also Known As)

  • Color Jet Printing (CJP)
  • Binder Jetting (BJ)
  • Binder Jetting with Metal Infitration (BJMI)

Process At A Glance

Common Materials

Gypsum/Sandstone

Standard Tolerance

+/- 3% 

Stock Surface Finish

~400 µin Ra

Lead Time

3-10 Business Days

Maximum Size

24x24x24

Minimum Layer Thickness

0.004" (0.100mm)

Minimum Feature Size

0.02" (0.50mm)

Minimum Wall Thickness

0.04" (1mm)

Color Jet Printing is capable of achieving full color prints
Color Jet Printing is capable of achieving full color prints

Advantages

  • Full Color Prints - CJP Binder Jetting machines can print in the whole color spectrum
  • Relatively Affordable - A cost effective technology for gypsum or metal prints

Limitations

  • Simple Geometry - More challenging post processing makes small features and complex designs more challenging to achieve than with other powder bed processes.    
  • Low Durability in Green State - Without a post-processing step (dipping in acrylate for gypsum parts, fully sintering or infiltrating with another metal for metal parts), binder jetting parts are highly anisotropic and typically fragile in the Z direction
A binder jetting print in gypsum powder.  The post-process removal of the parts is underway.  Photo Credit: Accendi
A binder jetting print in gypsum powder. The post-process removal of the parts is underway. Photo Credit: Accendi

Binder Jetting with Metal Infiltration

Example Machines

  • 3D Systems ProJet CJP 660Pro
  • ExOne M-Flex
  • ExOne S Max
  • ZCorp ZPrinter 650

Example Materials

  • Visijet PXL
  • Full Color Sandstone
  • Sand
  • Stainless Steel 316 matrix infiltrated with bronze
  • Stainless Steel 420 matrix infiltrated with Bronze