MJF Plastic PA12

Also known as HP Multi Jet Fusion PA12, Professional Plastic, HP Nylon Plastic, PA12, Polyamide


Gray Professional Plastic Black Professional Plastic

About MJF Plastic PA12

Multi Jet Fusion (MJF) Plastic PA12 is HP's nylon plastic with excellent mechanical properties and a slightly grainy finish. In black, it is also available in a smooth and slighlty glossy finish. MJF Plastic PA12 is an ideal choice for a wide range of applications from industrial parts to durable end-use goods. Its strength, durability and stiffness make it great for functional parts, such RC car parts and mounts. It is also popular for home decor, eyewear and games. MJF Plastic PA12 is printed using HP's Multi Jet Fusion technology and supports very complex geometries and thin features.

Common Applications

Mechanical & structural parts, mounts, cases, eye frames, tech accessories, drone parts, home decor, miniatures, art, prosthetics

Material Properties

High Strength & Durability
Good Impact Resistance
Professional Finish
Thin Features & Interlocking Parts

Handling and Care

Heatproof thermometer icon
Heat Deflection 95C/203F
Watertight icon
Chemical resistance icon
Good Chemical Resistance

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Frequently Asked Questions

What colors and finishes are available?

Gray: Medium gray with a matte and slightly grainy surface finish
Black: Dyed black with a matte and slightly grainy surface finish.
Black Smooth: Dyed black with a smooth and slightly glossy surface finish.

How long will it take before I receive a model in this material?

Production time depends on the model size and chosen finish, but usually product ship between 4 to 10 business days for Natural and 9 to 15 business days for Smooth with Priority manufacturing. The shipping time depends on your location.

How is this material made?

To LOL电竞下注 print in this material, we start with a layer of Nylon powder on a build platform. A set of inkjet heads pass across the powder layer and deposit heat reactive agents which are then selectively fused by fusing lamps above. Next, the build platform moves down, a new layer of powder is deposited and this process is repeated layer by layer until the parts are fully built.

Is this material watertight?

Yes, through testing we have found that this material is able to achieve watertight properties although swelling may occur. For best results resisting water, select Black Smooth PA12.

How does the strength in the direction between layers (z-axis) compare to the rest of the part?

The strength in the z-axis is comparable to the strength in the x & y axes, creating near homogeneous mechanical properties.

How are Black Smooth PA12 parts smoothed?

Black Smooth PA12 parts are smoothed using AMT PostProLOL电竞下注 technology. This is a physio-chemical process that smoothes all surfaces of the part, altering the geometry by no more than 0.4% dimensional change. This process leaves parts with a slightly glossy surface and makes parts watertight. Stepping on curved surfaces may still be visible after the part is smoothed.

Technical Documents

More Materials

Strength & Value
Many Colors & Finishes
Tech Accessories
Home Decor
Selective Laser Sintering (SLS)
Industrial Strength
Good Corrosion Resistance
Mechanical Parts
Tools and Fixtures
Structural Components
Selective Laser Melting
  • Bounding Box
  • Wall Thickness
  • Wires
  • Surface Details
  • Escape Holes
  • Clearance
  • Sprues
  • Interlocking Parts
  • Multiple Parts
  • Accuracy
  • Design Tips
  • Pricing


284 x 380 x 380 mm (Gray Natural and Black Smooth)
210 x 210 x 360 mm (Black Natural)
X + Y + Z > 9 mm (Natural)
10 x 10 x 10 mm (Smooth)

Your model should be within the minimum and maximum bounding box sizes. The maximum bounding box represents the largest model that we can manufacture. The minimum bounding box size is the smallest dimension in which we can manufacture in this material.


Min Supported Wall Thickness
0.4 mm (Natural)
1.5 mm (Smooth)
Min Unsupported Wall Thickness
0.5 mm (Natural)
1.5 mm (Smooth)
A supported wall is connected on at least two sides. Walls in your model must meet the minimum measurements to ensure it survives the printing and cleaning process. Thin walls are prone to warping during printing and are fragile to clean. Objects that meet the minimum requirements may still be rejected based on the geometry in which case our production team will communicate with you if the design needs improvements and can assist you to strengthen your model.


Min Supported Wires
0.8 mm (Natural)
1.5 mm (Smooth)
Min Unsupported Wires
0.9 mm (Natural)
1.5 mm (Smooth)

A geometry is considered a wire when it is thinner in both unconnected directions than its length. Wires that are under our suggested minimums are prone to breaking in the cleaning process, or warping.


Min embossed detail
Natural: 0.2 mm high & wide (0.4 mm high & wide for readable text, logos, and icons)
Smooth: 0.5 mm wide, 0.3 mm high
Min engraved detail
Natural: 0.2 mm high & wide (0.4 mm high & wide for readable text, logos, and icons)
Smooth: 0.4 mm wide, 0.3 mm deep

We recommend these minimum measurements for details like embossing or engraving, based on printer resolution. Although 0.2mm details will show up in this material, we find that text with a width and height of 0.4mm shows up most clearly.


Single Escape Hole Diameter
4.0 mm (Natural)
10 mm (Smooth)
Multiple Escape Hole Diameter
2.0 mm (Natural)
8.0 mm (Smooth)

Pressurized air is used to blast excess powder from models that are hollow, or contain hollow cavities. In order for us to safely do this, escape holes need to be larger than 4.0 mm in diameter. For models larger than 50.00 mm鲁 we require two or more escape holes at least 2.00 mm in diameter.

A single escape hole at the end of a cavity will not allow material in the corners near the escape hole to fully escape. So we recommend multiple escape holes at both ends of the cavity.


0.6 mm (Natural)
5.0 mm (Smooth)

Clearance is the space between an two parts, e.g. space between gears or a ball and socket joint.


2 mm thick, attached in at least 2 places per part

Sprues are wires that keep two models together. Sprues are more likely to break compared to other wires because they typically connect parts with high mass on either side. For this reason, they need to be thicker than our minimum wire thickness.


Natural: Yes, interlocking parts are possible with this material.
Smooth: No, the smoothing process will fuse interlocking parts together.


Natural: Up to 250.
Smooth: Up to 10.


Natural:卤0.25 mm + 0.1% of the length
For example: a product with dimensions of 50x50x100 mm can be 0.25 mm + 0.001*100 mm = 0.35 mm bigger or smaller in any direction.
Smooth: 卤0.4% (with a lower limit of 卤0.2 mm)


Print Lines or "Stepping"

A "staircase" effect, or print lines, can occur on the surface of your print. These can become more pronounced on curved and angled surfaces. The smooth finish can help reduce the visibility of these lines although some may still be visible.

Preventing Warping

Making your design more stiff (increasing torsional rigidity) will reduce the risk of warping. Longer walls need to be thicker than short ones.

Surface Details

Details like small text and patterns show up best in Black. Gray parts have the same level of detail, but variation in the surface color can obscure surface details in your model.

Sharp Edges

Edges and corners may be sharp and slightly raised from the surface by about 0.1 to 0.2 mm. If your model has many faces with edges and/or corners, the corners of one side may show more of this effect due to how it was oriented during printing. Adding a fillet with a radius of 3 mm or more will reduce this effect of raised edges.

Avoid "Spikes"

If your model has spike-like geometry where the spike is longer than it is wide, it is possible for it to break in the cleaning process.

Holes & Small Holes

We cannot clean holes that are too small compared to their depth. Additionally, tubes with corners can be difficult to reach and we may not be able to fully clean your model.

We recommend creating multiple access points to holes and small tubes so that we can properly clean your model.


MJF Plastic has a black core, which can be seen if a model is broken or scratched. Gray displays a light grey colour which, can vary in uniformity and shade. This can make models look slightly uneven and may vary between similar models. If a model's flat surface is oriented upwards, it can be subject to a significantly darker batch of grey in the center.


Occasionally, products may have small pores. This porosity can weaken the strength of the product, leading to more brittle parts. Pores are most prevalent in thin wires and on the edges of flat surfaces. To reduce the risk of pores, we recommend making round wires at least 3 mm thick. Additionally, they are less likely to occur on square beams than on round wires. We recommend 2 mm thick square beams.


Our production team does their best to evaluate your product and orient it to optimize either dimensionally accuracy or aesthetics depending on the application. Generally, the top surface will be rougherst and the bottom surface will be smoothest.


How will the price of my model be calculated?

  • Material Volume - the amount of material needed to LOL电竞下注 print your product
  • Machine Volume - the amount of space your product takes inside our LOL电竞下注 printers
  • Number of parts - a part is a piece of a model that can be separated from other pieces of the model
  • Production - associated production costs including labor; quality control; machine maintenance; general utilities; and other supporting services required to LOL电竞下注 print your product

What is the minimum price per part?

Gray: The minimum price per part is $7.50
Black: The minimum price per part is $10
Smooth: The minimum price per part is $15



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