Researchers Find New Way to Trace 3D-Printed Firearms Through Plastic Filament
Researchers are exploring how the plastic used in 3D-printed firearms could help investigators trace their origins and uncover new forensic evidence.
Researchers in Australia have developed a forensic technique that could help investigators trace 3D-printed firearms by examining the plastic used to manufacture them.
The study, conducted by researchers at Curtin University and ChemCentre, explored whether the chemical and thermal properties of 3D-printing filament could help identify its original commercial product. The findings were published in Forensic Science International on October 22, 2026 and received renewed coverage on November 1.
Unlike conventional firearms, 3D-printed weapons may lack serial numbers and other manufacturing identifiers. This makes tracing their origins particularly difficult for forensic investigators.
To address this challenge, researchers examined polylactic acid (PLA), a commonly used 3D-printing material, using a technique called differential scanning calorimetry (DSC).
The method measures how a material responds to changes in temperature, potentially revealing characteristics associated with different filament products.
In controlled experiments, researchers correctly matched 26 out of 28 printed PLA samples to their respective filament products, suggesting that thermal analysis could provide another investigative tool for examining 3D-printed objects.
The approach could become particularly useful when investigators recover a 3D-printed firearm alongside filament spools, manufacturing equipment, or other materials suspected of being connected to its production.
However, the findings have important limitations. The technique did not reliably identify products made from other common printing materials, including PETG and ABS.
The experiments also involved samples produced using a single printer under controlled conditions. Different printing temperatures, cooling rates, machines, and environmental exposure could affect the results.
Further validation is therefore necessary before the method can be considered reliable across different forensic casework conditions.
The research demonstrates how material analysis could complement traditional firearms examination by helping investigators establish potential connections between 3D-printed weapons and the materials used to produce them.