HP Multi Jet Fusion Design Guidelines

The following are important design guidelines to ensure part manufacturability, enhance the cosmetic appearance of parts and minimize overall production time.

Maximum Dimensions

284 mm x 380 mm x 380 mm

11.1 in. x 14.9 in. x 14.9 in. 

Accuracy

Layer Thickness: 80 microns /0.00315 in.

Minimum Feature Size: 0.5 mm /0.020 in.

For well-designed parts, tolerances of +/- 0.30 mm (0.012 in.) plus +/- 0.002 mm/mm (0.002 in./in.) for each additional inch can typically be achieved. 

Note that tolerances may change depending on part geometry.

Minimum Printable Features

Hole diameter at 1 mm thickness: 0.5 mm

Shaft diameter at 10 mm height: 0.5 mm

Printable font: 6 pt

Printable feature or detail: 0.1 mm width

Clearance at 1 mm thickness: 0.5 mm

Slit between walls: 0.5 mm


Materials

HP's High Reusability PA 12 is engineering-grade thermoplastics, optimized for 3D printing efficiency. 

It boasts the highest post-production surplus powder reusability.

Download the PA 12 Spec Sheet

Surface Finish

The standard finish includes a bead blast that removes all powder and leaves a consistent overall texture. Parts can remain in their natural state (a stony grey color) or can be dyed black.

Engraving

The technology makes it possible to printer letters and drawings with very high resolution and definition.

For parts with high thickness, the depth or protrusion should be higher than 1 mm.

Wall Thickness

Short walls orientated in the XY plane: minimum 0.3 mm

Short walls orientated in the Z planeminimum 0.5 mm

Note: It is recommended to increase thickness higher than this value or add ribs or fillets in order to reinforce parts.

In addition, designing your part as hollow as possible saves agent and powder and reduces sink marks.

Using Lattice

Multi Jet Fusion allows the printing of topology-optimized, generative designs, and even small lattice structures.

These type of designs help reduce:

- the weight of the part and the quantity of material used

- the operating cost in applications which are very weight sensitive

To ensure removal of all powder inside the part, the minimum gap recommended in a lattice structure is 1 mm.

Minimum Spacing


  • Between parts to be assembled after printing

Sometimes a pair of printed parts need to fit together due to their final application. To ensure correct assembly, it is recommended to have gaps of at least 0.4 mm (+/-0.2 mm tolerance of each part) in the interface areas that should fit together.


  • Between parts printed as assemblies

Parts to be assembled that are printed together should have a minimum clearance between them of 0.5 mm; however, our 3D engineering experts will assess your CAD file and determine if this clearance is acceptable.

Parts with very thick walls (above 50 mm) should have a higher gap to ensure proper performance.