HP Jet Fusion Information

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Information
We are still learning the capabilities and limitations of HP Strong and Flexible as it is a new material. Pricing and design guidelines are subject to change.
Finishes
Black Nylon 11 Gray
Black Nylon 11 Black
Price $2.50/part
$0.28/material cm3
$0.21/machine cm3
Ships in
See current status
15 business days

About HP Strong and Flexible

HP Strong and Flexible is Nylon 12 (PA12) printed on the new HP Jet Fusion 3D 4200 printer. HP's Multi Jet Fusion technology is a new printing process which uses agents and lamps to selectively fuse models in a powder bed. The multi-agent process fuses each layer together producing parts with a tensile strength in the z-axis which is comparable to the strength in the x-y plane.

This nylon material has excellent mechanical properties, with strength and density exceeding that of parts produced on other powder bed printing technologies. The strength makes it an excellent choice for functional parts, such as drone parts, RC cars, mechanical fixtures, camera mounts and phone cases. The surface is smooth, finished and semi-glossy, also making it a great material for jewelry, home decor, toys and games. HP Strong and Flexible can be thought of as a general use plastic that has a wide range of applications.

Design Guidelines for HP Jet Fusion

The rules to follow in order to create successful products in HP Jet Fusion. Read more on model checks

Rules

Max bounding box 250 × 340 × 300 mm

For us to be able to make a product, each of its pieces must fit within these dimensions.

For HP Strong and Flexible, the maximum bounding box is determined by the size of the printer we use to create your product. To ensure the successful creation of your product, make sure the bounding box fits within our maximum limit. If it does not, you can try scaling it down, removing unnecessary features to reduce the bounding box, or consider another material with a bigger maximum bounding box.

Min bounding box X + Y + Z > 7.5 mm

For us to be able to make a product, each of its pieces must be bigger than these dimensions.

For HP Strong and Flexible, the minimum bounding box is determined by our ability to successfully print very tiny products.

To ensure the successful creation of your product, make sure the bounding box of your model is larger than our minimum. If it is not, you can try scaling it up, thickening, combining, or enlarging parts and features, or trying a material with a smaller minimum bounding box.

Recommendations

Min Supported Wall Thickness Minimum 0.6 mm thick

For HP Strong and Flexible, the minimum thickness is determined by our ability to successfully clean your product once it has been removed from the printer. Features that are too thin often break when the product is removed from the powder bed, or when excess dust is removed from the product. To ensure the successful creation of your product, make sure the features are thicker than the minimum requirement. If they are not, try making them thicker, or consider a material with a smaller minimum thickness requirement.

Design tips

Prevent walls from warping on larger models

Large models with thin walls may warp depending on the geometry of the part. The material is sintered at a high temperature, and then it cools down to room temperature making it shrink. This shrinkage can create stress inside the material that may cause warping. Some geometries (e.g. large flat parts, open boxes) are more sensitive to warping than others. Making your design more stiff (increasing torsional rigidity) will reduce the risk of warping. Longer walls need to be thicker than short ones.

Min unsupported wall thickness 0.6 mm thick

An unsupported wall is one connected to other walls on less than two sides.

For HP Strong and Flexible, the minimum unsupported wall is determined by our ability to successfully clean your product once it has been removed from the printer. Walls that are too thin often break when the product is removed from the powder bed, or when excess dust is removed from the product. To ensure the successful creation of your product, make sure unsupported walls are thicker than the minimum requirement. If they are not, try making them thicker, adding supports, or considering a material with a thinner minimum unsupported wall requirement.

Design tips

Prevent walls from warping on larger models

Large models with thin walls may warp depending on the geometry of the part. The material is sintered at a high temperature, and then it cools down to room temperature making it shrink. This shrinkage can create stress inside the material that may cause warping. Some geometries (e.g. large flat parts, open boxes) are more sensitive to warping than others. Making your design more stiff (increasing torsional rigidity) will reduce the risk of warping. Longer walls need to be thicker than short ones.

Min supported wires 0.7 mm thick

A wire is a feature whose length is greater than five times its width. A supported wire is connected to walls on both sides.

For HP Strong and Flexible, the minimum supported wire is determined by our ability to successfully clean your product once it has been removed from the printer. Wires that are too thin often break when the product is removed from the powder bed, or when excess dust is removed from the product. To ensure the successful creation of your product, make sure supported wires are thicker than the minimum requirement. If they are not, try making them thicker, or consider a material with a thinner minimum supported wire requirement.

A note about sprues: Sprued parts are likely to break in our process causing production delays and potentially preventing your product from moving out of First to Try.

Sprueing your parts presents some unique challenges at quality checking for our manufacturing teams. For particularly complex geometries, it becomes difficult to ensure your sprued structure is completely intact with all of its parts before we ship it. If you must use sprues, use them sparingly, use 2mm thick wires, solid connections, and attach every part in at least two places.

Design tips

Thicker models are more difficult to bend

Flexibility depends on the structure and design of the model. The thicker you make something, the less flexible it will be. A spring made with 1mm wire will compress and elongate rather easily. A spring made with 3mm thick will take a bit more effort, and won’t compress if you drop it from a few feet.

Min unsupported wires 0.9 mm thick

A wire is a feature whose length is greater than five times its width. An unsupported wire is connected to walls on less than two sides.

For HP Strong and Flexible, the minimum unsupported wire is determined by our ability to successfully clean your product once it has been removed from the printer. Wires that are too thin often break when the product is removed from the powder bed, or when excess dust is removed from the product. To ensure the successful creation of your product, make sure unsupported wires are thicker than the minimum requirement. If they are not, try making them thicker, adding supports, or considering a material with a thinner minimum unsupported wire requirement.

Design tips

Thicker models are more difficult to bend

Flexibility depends on the structure and design of the model. The thicker you make something, the less flexible it will be. A spring made with 1mm wire will compress and elongate rather easily. A spring made with 3mm thick will take a bit more effort, and won’t compress if you drop it from a few feet.

Min embossed detail 0.2 mm for details
0.4 mm for readable text

A detail is a feature whose length is less than twice its width.

The minimum detail is determined by the printer's resolution. When detail dimensions are below the minimum, the printer may not be able to accurately replicate them. Details that are too small can also be smoothed over in the polishing process. To ensure details come out clearly, make them larger than the indicated minimum. We may refrain from printing products with details smaller than the minimum, since the final product will not be true to your design. If your product has details smaller than the minimum, try making them larger, removing them, or considering a material with finer detail.

Design tips

Thicker models are more difficult to bend

Flexibility depends on the structure and design of the model. The thicker you make something, the less flexible it will be.

Min engraved detail 0.2 mm high & wide
0.4 mm for readable text

A detail is a feature whose length is less than twice its width. Engraved or debossed details go into a surface.

The minimum detail is determined by the printer's resolution. When detail dimensions are below the minimum, the printer may not be able to accurately replicate them. To ensure details come out clearly, make them larger than the indicated minimum. We may refrain from printing products with details smaller than the minimum, since the final product will not be true to your design. If your product has details smaller than the minimum, try making them larger, removing them, or considering a material with finer detail.

Design tips

Thicken your engraved/embossed text to make it easier to read

Although 0.2mm details will show up in this material, we find that text raised at least 0.5mm shows up most clearly. If you want crisper text or embossed details, try bumping the thickness up to 0.5mm.

Min escape holes 4.0 mm diameter for one escape hole


2.0 mm diameter when there are two or more escape holes
Required for products bigger than 50 x 50 x 50 mm.

Escape holes allow unbuilt material inside hollow products to be removed.

When products contain hollow cavities, they are often filled with powder even after they are removed from the build tray. If escape holes are not large enough, or the geometry of the product makes it difficult to shake or blast the powder out, we cannot successfully clean it. This is especially important for our water-based dyeing process as models cannot be successfully dyed if they cannot be successfully cleaned inside and out.

To ensure a successful, cleanable product, make sure to include sufficiently large escape holes for each hollow cavity in your product. Multiple escape holes are recommended for large hollow parts. 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, multiple escape holes at both ends of the cavity are recommended. If your escape holes are insufficient, try enlarging them, adding more, or filling in the hollow space.

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.

Clearance 0.5 mm clearance

Clearance is the space between any two parts, walls or wires.

HP Strong and Flexible is printed by fusing nylon powder together. When there is a very small gap between features or parts, partially fused powder can get stuck in between. This can prevent mechanical parts from moving, or fill in intended gaps between features.

To ensure a successful product, make the clearance between parts, walls, and wires greater than the indicated minimum. If your clearance is too small, try making the gap bigger, or consider fusing the parts or features if their independence is unnecessary. You can also try a material with a smaller minimum clearance.

Interlocking and enclosed parts?

Yes.
HP Strong and Flexible is printed by fusing nylon powder together. This enables interlocking parts, as long as the distance between them is greater than the indicated minimum.

Multiple parts per model file? Yes.

More On Designing for HP Jet Fusion

Material Traits
Thicker models are more difficult to bend

Flexibility depends on the structure and design of the model. The thicker you make something, the less flexible it will be.

Print lines or "Stepping"

Depending on the shape of your model and orientation in the print tray, you might see print lines, or “stepping” phenomena on your model, which is a natural artifact of 3D printing. 3D printing works by printing layer by layer, and while our layers are around 0.08mm thin, there is a "step" between each layer, much like a staircase.

Material Info

Look and feel

HP Strong and Flexible is a Nylon 12 material 3D printed by fusing nylon powder together using black agents and heating lamps. The Gray finish is a heathered gray and the natural color out of the printer, while the Black finish is dyed. The material has high strength and density, which make it ideal for functional parts, such as RC cars and mechanical fixtures. The surface is smooth and semi-glossy, also making it an excellent choice for plastic jewelry and decorative items.

How it's 3D printed

HP Strong and Flexible is printed using HP's Multi Jet Fusion Technology.

HP developed its Multi Jet Fusion technology leveraging its extensive knowledge and expertise from more than 30 years of leadership in the ink jet printing industry. In HP’s Jet Fusion 3D printing solutions, a uniform layer of powder is deposited on the build platform. Then the powder is heated uniformly to just below sintering temperature using heating lamps above the powder. Next, a set of inkjet heads pass across the powder while depositing fusing and detailing agents where parts will be built in a single, continuous pass. The ink deposits a 2D image of each layer or cross-sectional area of the models. Simultaneously, fusing lamps pass across the powder bed as ink is being deposited. The agents and the energy from the fusing lamps cause the powder to selectively fuse together. The agents and the closed loop thermal control system dictate where and how much energy the powder absorbs so it reaches a perfect fusing temperature in the areas where models are being built. The fusing agent controls where powder will be fused together while the detailing agent is applied to modify fusing and create fine detail and smooth surfaces. Next, the build plate moves down, a new layer of powder is deposited and this process is repeated layer by layer until the parts are fully built.

Similar technologies fuse powder together point by point. But with HP’s Multi Jet Fusion technology, each layer of powder is fused together in a single continuous pass whose time is independent of the density of parts on your build.

After printing, the powder is cooled before handling. Then the build chamber is transferred to a post-processing station. Parts are extracted from the powder while using a vacuum system which collects loose powder. The loose powder which is collected is recycled and re-used for future builds. Excess powder on the parts is removed using air and media blasting guns until they are clean.

Technical documents

Disclaimer:
Please note that the 3D printed products are intended for decorative purposes. They are not suited to be used as toys or to be given to underage children. The products should not come into contact with electricity and be kept away from heat. Our materials, except for Porcelain, are not food safe.
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