a 3-D printed pelvis (NIH 3D Print Exchange)

How to verify a 3-D printed object

As 3-D printing grows more popular for manufacturing medical devices, parts and equipment for the military, tools for astronauts and even structurally sound habitats for deep-space exploration, hacks or even inadvertent errors can put users of 3-D printed parts in danger. Last year, researchers showed that a drone could be sabotaged by hacking the design files the 3-D printer used to manufacture the propeller.

A recent study from researchers at Georgia Institute of Technology and Rutgers University-New Brunswick, however, provides ways to double check the validity of an object created by  additive manufacturing.

Luis Garcia, a coauthor of the research and PhD candidate at Rutgers, said these checks will become important as 3-D printing is more frequently used in day-to-day manufacturing.

“As additive manufacturing becomes more integrated into the industry, we need a means of verifying models that are printed by third-party companies,” Garcia said in an email to GCN.

A 3-D printed object could have flaws for several reasons, including an attack on the hardware or software of the computer running the printer, an operational error or even a third-party trying to save on materials, Garcia said.

However, there are some ways to check the integrity of the printing. One way is by monitoring sounds created by the 3D printer and tracking the movement of the extruder, or the arm that deposits the material.

“The acoustic and spatial sensing provides runtime verification," meaning researchers can tell if the printer is following the software instructions, Garcia said.  As soon as we detect a discrepancy, we can shut down the printing process, he added.

Another way to verify the integrity of the printed object is by embedding a secondary material “in the model in a pattern only known to the customer/verifier,” he said. Garcia's team inserted gold nanorods in the filament sent to a manufacturer. Because the researchers knew where the nanorods should end up in the 3D-printed model, verification of those locations would indicate the model was printed correctly.

Read more about the research here.

About the Author

Matt Leonard is a reporter/producer at GCN.

Before joining GCN, Leonard worked as a local reporter for The Smithfield Times in southeastern Virginia. In his time there he wrote about town council meetings, local crime and what to do if a beaver dam floods your back yard. Over the last few years, he has spent time at The Commonwealth Times, The Denver Post and WTVR-CBS 6. He is a graduate of Virginia Commonwealth University, where he received the faculty award for print and online journalism.

Leonard can be contacted at mleonard@gcn.com or follow him on Twitter @Matt_Lnrd.

Click here for previous articles by Leonard.


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