Post-Processing for 3D Printing

Post-processing of 3D printed parts is often overlooked, but additive manufacturing has moved beyond prototyping to produce end-use parts directly for the consumers; the look and feel are becoming of greater importance. This is where post-processing plays an active role in achieving the required finish. Post-processing 3D-printed parts help remove excess material and is a prerequisite for painting or coloring a part. Following is a list of post-processing methods applied on various functions depending on the customer’s requirements.

Clear coating

It is a post-processing technique commonly applied to parts to obtain a cosmetic finish. As painting is also possible on 3D-printed parts, a little polishing is often needed to make the surface smooth, after which the piece can be painted with whatever colors you like. You need to get the Pantone numbers with your design upload, along with a CAD model showing which color goes where and the parts can be sprayed with an automotive-grade paint or Soft-touch painting for an attractive finish.

Plating

Plating is required on 3D-printed parts to increase strength and durability. Electroless nickel plating can make a cast aluminum or magnesium part look more elegant and suitable for lightweight applications.

Dyeing

Stereolithography (SLA), selective laser sintering (SLS), Multi Jet Fusion (MJF), and PolyJet parts can be dyed black, green, red, blue, or yellow. The finished pieces are only briefly exposed to a hot dye to achieve a prominent color. This is one of the quickest and most cost-effective ways to make printed parts look more appealing.

Decaling

You can personalize a part by adding company logos, safety warnings, and other graphics. Adhesive and thermal-transfer decals frequently do not adhere to the rough surface of some 3D-printed parts, so sanding or smoothing is required before deciding.

Texturing

Making 3D-printed parts less slippery improves their finish, ergonomics, and cosmetic appearance. To enhance weather and sun resistance on the UV-curable materials used with SLA, this technique can apply a soft-touch paint or urethane clear coat to a 3D-printed part.

Polishing

It is practiced with 3D-printed parts to achieve a high-quality finish. Smoothing is frequently required when applying paint and decals. However, If a higher finish is a requirement, then you need to specify your finish expectations, and the manufacturer can do it for you.

Heat treating

It is ideal for removing heat-induced stress and potential warping from metal parts created with direct metal laser sintering (DMLS). It also hardens, strengthens, and prevents cracking and fatigue in DMLS metals. If you need a 3D-printed metal that is extremely tough and hardened, stainless steel 17-4 PH is the best option.

Many post-processing options are available, and depending on the material type and requirement, the best technique is selected and applied to the 3D-printed part to achieve the desired finish.

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