Online 3D Printing Service | Multi Jet Fusion (MJF) 3D Printing Service

Overview

Our MJF 3D Printing Service

What is MJF

MJF is Multi Jet Fusion launched by the technology giant HP. Its appearance aims to solve the three main problems faced by the current 3D printing technology: speed, precision and cost. According to HP, its printing speed will be more than 10 times faster than any other 3D printing technology on the market, and it will also have the same precision and strength.

How Does MJF Work?

MJF technology mainly utilizes two separate thermal inkjet arrays to create 3D objects. As the print works, one moves side to side, ejecting material, and one moves up and down, spraying, coloring and depositing to give the finished product the desired strength and texture. The two arrays then change direction to maximize coverage and productivity. Next, a refiner is sprayed onto the already formed structure. Afterwards, external heat is applied to the part that has been and is being deposited. These steps are repeated until the entire object is printed in layers.

Features of MJF Technology

Advantages

Easy and fast

The prototype is directly made from the CAD digital model, the processing speed is fast, the product production cycle is short, and no cutting tools and molds are required.

Prototype with complex structures

It can process prototypes and molds with complex structures or shapes that are difficult to form using traditional means. Provide samples for experiments, and can verify and check the results of computer simulation calculations.

Remote control

It can be operated online and remotely controlled, which is conducive to the automation of production.

Drawbacks

Material defect

The printing material is mainly nylon powder, which cannot form a smooth surface.

Available materials for MJF 3D Printing

Here is a list of our standard 3D printing materials available through our online platform.

MJF 3D Printing Plastics

Nylon
HP-PA-12

Custom Material

The materials available on the online system may not be exhaustive of all materials available on the market. If the materials you need are not listed on the order page, please select "custom" under the material menu, and our engineers will review and purchase.

Our standard surface finishes

Spray painting - Matt paint

Spray painting: Using spray guns with air pressure to disperse into uniform and fine droplets and apply the painting to the surface of the object.

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Spray painting - High gloss paint

Spray painting: Using spray guns with air pressure to disperse into uniform and fine droplets and apply the painting to the surface of the object.

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Vacuum plating - High gloss paint

Vacuum plating mainly includes vacuum evaporation, sputtering and ion plating.

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Vacuum plating - Matt paint

Vacuum plating mainly includes vacuum evaporation, sputtering and ion plating.

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#1000 sanding

Sanding is the use of fine abrasive sand particles to rub the surface of the product to produce a diffuse, non-linear texture effect.

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Silkscreen

Silkscreen generally refers to screen printing, which is the process of pressing ink through a stencilled mesh screen to create a printed design, graphics and text.

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Laser engraving

Laser engraving is the use of laser technology to engrave text and pattern on objects.

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Dyeing

Dyeing is done in a special solution containing dyes and particular chemical material.

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View more surface finishes

Our MJF 3D printing capability

Size	Metric units
Max part size	380284380mm
Min. feature size	0.8mm

Tolerances

Length(L)	Metric units
L≤100mm	±0.25mm
L>100mm	±0.25%*L

3D Printing Design Guidelines

We have summarized recommended and technically feasible values for the most common features encountered in 3D printed parts.

1. Wall thickness

The wall thickness directly determines the strength of the printed object, and also determines whether the model can be printed.
Once the model is printed, it also goes through support removal, grinding and sandblasting, which determine the minimum wall thickness for different materials. The model is printable only when the wall thickness meets the minimum requirement.

Process	5*5mm	10*10mm	50*50mm	100*100mm	200*200mm
SLA	0.5mm	0.8mm	1mm	1.2mm	1.5mm
DLP	0.5mm	0.8mm	1mm	1.2mm	1.5mm
SLS	0.8mm	1mm	1.2mm	1.5mm	2.0mm
MJF	0.8mm	1mm	1.2mm	1.5mm	2.0mm
SLM	1mm	1.2mm	1.5mm	2.0mm	2.5mm
FDM	1mm	1.2mm	1.5mm	2.0mm	2.5mm

2. Embossed and engraved detail

As the height or depth of detail is less than the minimum detail requirements, it will not be able to print accurately, can not be polished, paint and other post-processing. It is recommended that you increase the height/depth, or remove the section.

Process	Min embossed detail	Min engraved detail
SLA	0.5mm	0.5mm
DLP	0.5mm	0.5mm
SLS	0.8mm	0.8mm
MJF	0.8mm	0.8mm
SLM	1mm	1mm
FDM	1mm	1mm

3. Threads and screws

Pitch refers to the axial distance between the corresponding points of two adjacent teeth on the thread. Profile angle refers to the angle between the two sides of the whorl profile. Your design needs to meet the requirements of minimum pitch:0.6mm and minimum profile angle:20°

4. Hole diameter

The following is the minimum diameter can be achieved.

Process	Min diameter
SLA	0.8mm
DLP	0.8mm
SLS	1.5mm
MJF	1.5mm
SLM	1.5mm
FDM	1.5mm

5. Sharp surfaces

When the wall thickness is very small, models with sharp surfaces can be easily damaged during support removal, grinding, packaging, and transportation. If sharp surfaces exist, the angle should be greater than 20 degrees.

6. Clearance

Parts clearance refers to the distance between any two parts, thin wall or column, as shown above. The min clearance is 1mm. When the clearance is small, it will not be able to remove the supporting material. It is recommended that you increase the clearance size or choose other materials required by the clearance. If the independence of the two parts is not important, it is recommended that you merge them into one part.

Assembly clearance refers to the distance between any two parts to be assembled, as shown above. The min clearance is 0.2mm.

FAQ's

What surface finish and post-processing options do you provide for MJF parts?

Our MJF service uses only one material: HP-PA12 nylon. After standard bead blasting for powder removal, the available surface finishes are dyeing, matte vacuum plating, matte spray painting and high-gloss spray painting. No other extra finishing options are supported for MJF parts.

What is the maximum build size for your MJF 3D printing?

Our maximum build size for MJF printing is 380 × 284 × 380 mm, suitable for medium-sized functional parts and prototypes. For oversized structures, we provide split printing and assembly service.

What is the minimum feature size and wall thickness for MJF printed parts?

The minimum printable feature size for MJF is 0.8mm. For wall thickness, 0.8mm is the minimum for small 55mm parts, and the thickness needs to be increased to 2.0mm for 200*200mm large parts to avoid deformation during post-processing and use.

All design files must have no broken holes. Keep main wall thickness above 1.2 mm, and ensure the thinnest feature is at least 0.8 mm. Thinner structures will bring printing failure and post-processing risks.

What are the dimensional tolerances for MJF 3D printed parts?

Our MJF printing tolerances are strictly controlled: for parts with length ≤100mm, tolerance is ±0.25mm; for parts longer than 100mm, tolerance is ±0.25% of the total length, meeting the precision requirements of most industrial functional assembly.

What materials do you currently offer for MJF 3D printing?

Our standard and only MJF printing material at present is HP-PA12 nylon powder, which has excellent toughness and structural consistency, and is suitable for manufacturing functional parts requiring repeated assembly and impact resistance. Custom material options are available upon specific project requests after engineering review.

What are the minimum embossed and engraved details MJF printing can achieve?

MJF printing can stably achieve minimum embossed and engraved details of 0.8mm. This precision can clearly restore small logos, text and fine structural features on the part surface without blurring or incomplete forming caused by powder sintering.

What are the design requirements for threads and screws in MJF printing?

For MJF printed threads to ensure smooth assembly and durable use, the design needs to meet a minimum pitch of 0.6mm and a minimum profile angle of 20°. Standard metric fine and coarse threads can be stably formed, with no sliding tooth issue during repeated screwing.

What is the minimum hole diameter and clearance requirement for MJF printed parts?

We can stably print holes with a minimum diameter of 1.5mm for MJF, with smooth inner walls and no residual powder. For part clearance, the minimum gap between independent structures (thin walls/columns) is 1mm for easy powder cleaning; the standard assembly clearance is 0.2mm to ensure precise fitting without jamming.

What are the design requirements for sharp surfaces in MJF printing?

If the MJF printed part has sharp surface structures, the included angle should be designed to be greater than 20°. Sharp angles smaller than this are prone to chipping, powder falling or damage during powder cleaning, sandblasting, packaging and transportation, affecting the structural integrity of the part.

What design file formats and size limits do you accept for MJF printing?

We accept common 3D CAD file formats including .stl, .obj, .step and .stp, with a single file size limit of 500MB. To ensure efficient order review, please do not upload compressed ZIP/RAR folders, and make sure the design files have no broken holes or invalid geometric structures.

Note: No broken holes in the design documents. Wall thickness > 1.2mm, and the thinest part ≥ 0.8mm.

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