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Fohan MJF Printing Service
Multi Jet Fusion MJF known as HP 3D printing,  is an industrial 3D printing process that produces functional nylon prototypes and end-use production parts in as fast as 1 day. Multi Jet Fusion uses an inkjet array to selectively apply fusing and detailing agents across a bed of nylon powder, which are then fused by heating elements into a solid layer. After each layer, powder is distributed on top of the bed and the process repeats until the part is complete. This highly efficient method can build functional, geometrically complex parts 80 micron layers at a time - with mechanical properties that rival injection molded parts.

Bead Blasting
This process consists of shooting an abrasive media, usually a bead (size and type results in different surface finishes), at high pressure at a printed part with compressed air, knocking loose unfused powder while also smoothing the finish of the part. This can be done manually or automatically, with manual bead blasting relying on a foot pedal-driven system for propelling the beads as opposed to an automated tumbler, turntable or conveyer. Manual may be preferred for fragile parts.

Sanding

Post-processing techniques can range from manual to almost entirely automated. For example, a company may want to smooth their Multi Jet Fusion parts; this could be done with manual sanding, though it would take a long time and be cost-prohibitive. However, it may work for one-off objects or visual prototypes.

Chemical Polishing

This process uses a chemical to smooth the surface of printed parts without impacting its mechanical properties, resulting in a controllable level of glossiness from matt to gloss to shiny.

Dying

Dying: In addition, not unlike other processes, MJF parts can be subject to any number of finishes. Though there is an MJF line dedicated to full-color 3D printing (HP Jet Fusion 580/380 series), these systems are currently designed for smaller batches. When coloring parts that haven’t been printed on those machines, dying can be performed, either manually in pots of hot water or using automated dying equipment. Dyeing is the most common secondary post-processing technique of

Painting and Electroplating
Painting and plating are other options for coating Multi Jet Fusion parts. Performing surface smoothing first will help achieve the best results with the least additional effort.  Because every industry has its own painting  specifications, the best bet is to have samples done with existing painting suppliers. Hydrographs are another method of coating. An image or pattern is floated on water,  the part is dipped in it to transfer the pattern over. Given that a layer of material is applied in the process, hydrographs also result in a smoother surface.Electroplating consists of dissolving a metal in a solution and attaching the metal particles to the surface of the printed part using an electric current. Before this process can be performed on a polyamide part, the part must be made electrically conductive through the use of electroless plating, gas activation, or a conductive coating.