Surface finishes overview

A surface finish is any treatment applied to a part after it is machined or printed. It can change how the part looks, how it resists corrosion and wear, and how much it costs.

Every part on OpusFab gets a finish selection, even if that selection is “no finish”. The finish is set per part in the quote table, either when you upload a single file or in the Edit drawer of each row after a multi-part upload.

Cosmetic vs functional finishes

Finishes fall into two broad groups, and many do both jobs at once.

Cosmetic finishes are about appearance. They hide tool marks or layer lines, even out the surface texture, and add color. Examples: bead blasting, powder coating, polishing.

Functional finishes change how the part performs. They add corrosion resistance, surface hardness, or wear protection. Examples: anodizing for corrosion resistance, PVD for hardness and wear.

When you choose a finish, start with what the part needs to do. A bracket hidden inside an enclosure rarely needs anything. A visible housing that gets handled daily probably needs both protection and a clean look.

The finish names OpusFab uses

OpusFab uses one set of unified finish names across all processes, so the same name means the same thing everywhere: in the quote table, in BOM imports, and in your order summary.

• Raw (As-Machined): the default for CNC parts. No secondary processing. See As-machined vs as-printed.
• As Printed: the default for 3D printed parts. The part comes off the printer with no additional surface work.
• Bead blast / sandblast: abrasive blasting that creates a uniform matte texture and hides tool marks.
• Anodizing: an electrochemical oxide layer on aluminum, clear or dyed a color. See Anodizing.
• Powder coating: a thick, durable colored coating chosen from a Pantone/RAL picker. See Powder coating.
• PVD: a thin, very hard coating, for example Black. See PVD coating.

The full live list of finishes for each process and material is shown in the quote editor. Check there for what is currently available for your part, since availability depends on the process and material combination.

How finishes affect price

Finishes are priced per part and added on top of the base machining or printing cost. A few rules of thumb:

• The default finishes (Raw (As-Machined), As Printed) add nothing. They are the cheapest options.
• Blasting is a low-cost step. It is mostly labor and machine time.
• Anodizing, powder coating, and PVD cost more because they involve chemical baths, curing ovens, or vacuum chambers, often at a specialist finishing supplier.
• Cost scales with part size and surface area, since bigger parts take more material and tank or oven space.

You will see the finish cost reflected in the unit price as soon as you change the finish in the quote table, so you can compare options directly.

How finishes affect lead time

A finish adds days, because the part has to go through an extra process after it is made. Coating processes like powder coating and PVD typically add more time than a quick blast, since parts may ship to a finishing supplier and back.

The lead time shown for your batch is the longest lead time of any part in it. One finished part can set the pace for the whole batch. If you need most parts fast, consider splitting finished parts into a separate order, or read Lead times for how batch lead time is calculated. Production speed (Standard or Expedited) is a separate batch-wide choice and is covered in Production speed: Standard vs Expedited.

Choosing a finish: a quick guide

1. Does the part need corrosion resistance or wear protection? If yes, look at anodizing (aluminum), powder coating, or PVD.
2. Is it purely cosmetic? Bead blast for a matte look, anodizing or powder coat for color.
3. Is it a hidden or internal part? Leave it at the default and save the money.
4. Are the tolerances tight? Thick coatings add material to the surface. Check Tolerances explained before coating a precision feature.