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Surface Finishing

With the introduction of chemical vapor smoothing, a technology that smooths the surface of 3D prints via vaporized solvents, 3D printed plastics are now more suitable than ever for low-volume production. 

Vapor smoothing enhances performance and aesthetics of each part creating an injection molding look and feel. Sealed surfaces are easier to dye, easier to certify for skin and food contact, all while keeping dimensional accuracy without marks from fixtures. 

The chemical vapor smoothing is achieved with AMT’s PostPro3D technology. Unlike physical smoothing processes such as sanding or media tumbling, vapor smoothing does not remove material on the workpiece. Instead, a vapor finishing agent is introduced into a sealed processing chamber with the parts. The vapor clings to the part surface where it creates a controlled chemical melt. This melt reduces the surface peaks and valleys by liquifying and redistributing material and evening the surface. The melt also has the effect of enhancing shine.

Once the parts are finished, the chamber is heated to evacuate the finishing agent to a collection vat. No residue is left on the parts. Smoothed parts are then ready for shipping or another secondary process such as dyeing.

Engineered Coatings are available in a wide variety of colors. Cerakote® engineered coatings are a practical long-term solution for finishing Multi Jet Fusion parts.

The distinctive polymer-ceramic technology of the coatings can enhance the performance and physical characteristics of polymer MJF parts including:

- Hydrophobic properties (repels water and prevents water absorption)

- Chemical resistance to acids and solvents

- Abrasion resistance

- Heat protection of the surface

- Harder, more durable finish

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