Finishes

Post-Processing Techniques and Smoothness Factors

3Diligent supports myriad finishing techniques. Finishes can serve to make a surface smoother or rougher, or to give it unique surface properties for a given application.

Defining Finish Level

Much of 3Diligent's supply base—especially those working with metals—will utilize Ra as a term to demonstrate the relative smoothness of a surface. This allows manufacturers to achieve a universal degree of finish across the many processes and materials available through the platform. For a definition of Ra, please review the information at these links:

When submitting an RFQ, you are welcome to reference a specific Ra level you would like to achieve on your parts. It is worth noting that as printed finish can vary from ~Ra 32 on stereolithography (SLA) or digital light processing (DLP) prints to as high as Ra 600 – 800 on as-printed electron beam melting (EBM) metal prints.

Finish Examples

For reference, below are pictures of parts next to American coinage and their approximate Ra levels:

3Diligent finishes for rapid-manufactured products

Ra 800

EBM as-printed displayed

3Diligent finishes for rapid-manufactured products

Ra 400

DMLS as-printed displayed

3Diligent finishes for rapid-manufactured products Ra 250

Ra 250 (top), Ra 125 (bottom)

DMLS with some finishing displayed)

3Diligent finishes for rapid-manufactured products Ra 50

Ra 50

CNC displayed

3Diligent finishes for rapid-manufactured products Ra 32

Ra 32

SLA displayed

3Diligent finishes for rapid-manufactured products

Ra 16 or less

Differences in finish for parts of Ra 16 and below are difficult to convey via photo, although the reference coins provided in these photographs demonstrate a degree of mirror finish.

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