How Industrial 3D Printing in HP MJF Polyamide Really Works.

What is HP's MJF Technology, What is PA12 and Where Can It Be Used?

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[20/11/2019]

The concept of the 3D printing or three-dimensional printing, is the creation of objects and images, by means of a step by step process of addition and solidification of powdery or liquid substances such as resin, powder, plastics, concrete and composites.

There are several processes involved in 3D printing including; Digital Light Processing (DLP), Selective Laser Melting (SLM), Stereolithography (SLA), Selective Laser Sintering (SLS) and of course the Multi Jet Fusion (MJF), which is the focus of this article.

What Is Multi Jet Fusion (MJF)?


A part of the powder bed fusion group of 3D Printing technologies, Multi Jet Fusion offers faster, cost-effective and industrial thermo fusing powder particles together layer by layer, in order to create 3D object.

Difference Between MJF And SLS

Although both MJF and SLS are industrial powder based technologies; both differ in provision of heat source. While SLS technology makes use of a laser to fuse material, MJF uses infrared light, absorbed by the Polyamide particles through the aid of a fusing agent.
Another difference is the recycling of residual powder obtained from both processes. The residual powder from SLS is 50% recyclable while MJF is 80% to 90% recyclable.
In addition, while MJF only works on Black PA12 material, while SLS works with an array of materials which include Flexible Plastic, Alumide, PA12 Plastic and Glass – filled Nylon. This means that MJF has limited finishing options. That being said, PA12 is significantly easier to paint, opening the door to a world of painted 3D Prints.
A difference in production time is another factor that differentiates both 3d printing technologies, as SLS requires up to 24 hours to cool off and MJF requires only 10 hours.

How Does Printing In Polyamide MJF Work?


As earlier stated, the MJF is a powder-based technology which works with fine granular powder also known as Polyamide. Polyamide is a white, smooth, soft, lightweight, flexible granular powder, which comes in varying of dyed and natural finishes.
The Polyamide material works well for models requiring labels, surface details and crisp textures, such as prototypes, end products, functional models, complex models and small series of components; and it can be used to make jewelry, gadgets, movable puzzles and fashion pieces.

Unlike other powder fusion technologies, the Multi Jet Fusion technology doesn’t require the use of lasers to scan and forge the Polyamide particles. Alternatively, MJF technology makes use of a fusing agent which helps to administer heat radiation to the model being processed.
During the MJF process, the Polyamide powder is spread out on powder bed, after which drops of bonding agent are selectively deposited across the Polyamide spread, on voxels to be bonded.
This process is repeated continuously until the encapsulated areas are completely processed and allowed to cool off. Finally the 3D printed objects are air blasted to get rid of residual Polyamide powder in the model. How

How To Get The Perfect Polyamide (MJF) Design

• To get a perfect Polyamide (MJF) model, endeavour to work with a minimum wall thickness of 1mm. if you are working with living hinges, 0.5mm is a suitable size to work with.
• The maximum dimension you can use for your MJF print is 256 x 340 x 360mm, but you can print in subparts if you so desired.
• Endeavour to avoid causing warping when working on large flat plains.
• When engraving on your Polyamide (MJF), keep in mind that the thickness of engraved textures should be nothing less than 0.25mm.

The Polyamide (MJF) technology is a fusion of the binder jetting and SLS technologies; hence it offers a more robust 3D printed item. Polyamide (MJF) works faster than the others, requires less cool time (an average of 10 hours) and is cost effective; which makes it a perfect choice for all your 3D printing works.

SKLPTOR.com offers the latest in MJF technology accessible in just a few clicks! Click here to upload your file for an instant quote!

Creating your first 3D Print? Check out our guide on creating your first 3D Printable model.


You can also view our video on how to use SKLPTOR for online 3D Printing.

Edited By: Aaish Kanjer

Aaish Kanjer is the Co-founder and CEO of SKLPTOR. He is the one responsible for day to day operations at KOL. Amongst his hobbies are reading, football and evidently editing blog posts.

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