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Related Experiment Video

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Forensic 3D printing from micro-CT for court use- process validation.

Waltraud Baier1, Danielle G Norman1, Michael J Donnelly1

  • 1University of Warwick, CV4 7AL, Coventry, UK.

Forensic Science International
|November 13, 2020
PubMed
Summary

Forensic 3D printing using micro-computed tomography (micro-CT) shows sub-millimeter accuracy for bone models and toolmarks. Different 3D printing technologies yield varying error rates, with micro-CT recommended for forensic applications.

Keywords:
3D printingAdditive manufacturingForensic evidenceMicro-CTSurface comparison

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Area of Science:

  • Forensic Science
  • Biomedical Engineering
  • Materials Science

Background:

  • 3D scanning and printing are increasingly used in forensic science for evidence creation.
  • Rigorous assessment of 3D model creation processes is needed to meet legal standards.
  • Previous accuracy assessments focused on medical CT, not micro-CT, which offers higher resolution for forensic details.

Purpose of the Study:

  • To quantify error rates in forensic 3D printed models and toolmarks derived from micro-CT data.
  • To compare the accuracy of three different 3D printing technologies for forensic applications.
  • To evaluate the suitability of micro-CT for generating high-fidelity forensic 3D bone models.

Main Methods:

  • Micro-computed tomography (micro-CT) was used to scan bone samples.
  • 3D models of bone surfaces and toolmarks were created from micro-CT data.
  • Three distinct 3D printing technologies were employed to produce physical models for accuracy assessment.

Main Results:

  • 3D printed models replicated bone surface geometry with sub-millimeter accuracy (overall shape <0.62mm, toolmarks <0.36mm).
  • Significant variations in accuracy were observed across the three printing technologies.
  • Mean errors for shape geometry ranged from -0.8% to 0.7%, and for toolmark geometry from -0.8% to 14.1%.

Conclusions:

  • Micro-CT imaging is recommended for creating forensic 3D printed bone models, especially when injuries are present.
  • The choice of 3D printing technology significantly impacts the accuracy of the final forensic evidence.
  • Further research is needed to optimize 3D printing processes for forensic applications.