In additive manufacturing, it’s what comes after 3D printing: post-processing

The National Institute of Standards and Technology (NIST) found the amount of post-processing required in their additive manufacturing lab to be “surprising” (Technical Note 1801, page 23).

After printing an object, all loose material — nano-scale powders — had to be removed.

Supports required during the print run were cut off and some objects/materials require sustained heat treatment.

Appearance issues were addressed with hand tools or CNC devices.

There will be particles that shouldn’t be inhaled

For post-processing 3D printed items, a customer company wanted the budgetary benefits of RoundaireTM cleanable, re-usable filters while simultaneously increasing respiratory protection for workers.

They asked if we could connect the RoundaireTM to a downdraft bench. We can and we did.

Sentry Air's Roundaire fume extractor attached to a downdraft table via flexible hose.

Being tested before shipment, a Sentry Air RoundaireTM Portable Fume Extractor is connected to an Industrial Downdraft Bench and Table via python flexible hose and a standard adapter plenum.

RoundaireTM pulls particles away from operator

A filter is the key RoundaireTM component. Cabinetry is limited.

The unit’s standard filter is rated MERV 16, a rating typically recommended for use in hospitals and surgery suites.

MERV 16 filters can trap a variety of particle types, including bacteria, insecticide dust, and paint pigments. Sentry Air's Roundaire portable fume extractor comes equipped with a variable speed controller and a magnehelic gage.

Coupling a MERV 16 filter with adjustable velocity gives operators the ability to match air volume with particle behavior.

The unit’s Magnehelic Gage provides useful information about the filter’s saturation status. Operators use its readings to determine when to clean the filter.

The filter can be cleaned with pressurized air while in the unit. Debris falls to a dustpan in the unit’s floor and the filter can be immediately put back in service.

Stainless steel bench top

Industrial Downdraft Bench and Table provides a 1/4” perforated stainless steel work surface.

Airflow from the RoundaireTM pulls contaminants and particles down, through the perforations and into the MERV 16 filter.

The work surface is smooth, strong and tolerates heat.

Additive manufacturing and post-processing at your shop?

If respiratory protection, budget and effectiveness are merging in your operation, talk with our applications specialists. Call them at 800.799.4609 or email

You can also contact them via the feedback form below.




Lessons Learned in Establishing the NIST Metal Additive Manufacturing Laboratory, NIST Technical Note 1801, National Institute of Standards and Technology, U.S. Department of Commerce

Additive manufacturing technologies and the respiratory hazard of UFP

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