"a standard FDM 3D printer that uses PLA 3D printing material"

"printers used by researchers in their study were a Stratasys Dimension Elite"

So, a Stratasys Dimension Elite prints with PLA now, huh? Nope, just ABS. More likely, the reference to PLA in this article is incorrect and should read ABS.

Also, near the end, SLR should probably read SLA.

Anyone proof reading these articles...?