First Standardized Material Testing of 2PP 3D-Printed Parts

UpNano printers and resins for macroscopic test specimens. Superior properties compared to conventional resin-based 3D-printing.
By: UpNano
VIENNA - Feb. 23, 2024 - PRLog -- For the first time, mechanical properties of 2PP 3D-fabricated bulk specimens in the mm to cm range have been tested using established standardized methods. This breakthrough was made possible by combining the use of the fastest commercially available 2PP 3D-printer (NanoOne) with resins that can be processed at very high volumetric build rates, enabling upscaling. The test results, now published in Advanced Materials, demonstrate the superior material quality of the UpPhoto and UpDraft resins compared to an acrylate resin (ETA/TTA). In addition, both materials are fully cured immediately after printing, eliminating the need for post-treatment. A multinational collaboration involving researchers from Technical University Vienna (TU Wien), California Institute of Technology (Caltech) and the RWTH Aachen University, along with materials experts from UpNano GmbH conducted the comprehensive study.

Two-photon polymerization (2PP) 3D-printing is a powerful, high-resolution technology for additive manufacturing. The latest generation of 2PP 3D-printers combines the achievable high-resolution with a high production speed (up to >450 mm3/h), enabling the manufacture of large structures up to several centimeters in size. This makes 2PP 3D-printing attractive for both industrial applications and large-scale production. As a result, standardized methods for the mechanical characterization of 2PP 3D-printed parts are becoming increasingly important. An international team has now succeeded for the first time in applying standard test methods to (macroscale) 2PP 3D-printed parts, e.g., 35 mm large ISO-standard test specimens, providing invaluable insight into their mechanical properties.

Original Publication: Approaching Standardization: Mechanical Material Testing of Macroscopic Two-Photon Polymerized Specimens. T. Koch*, W. Zhang, T. T. Tran, Y. Wang, A. Mikitisin, J. Puchhammer, J. R. Greer, A. Ovsianikov*, F. Chalupa-Gantner* & M. Lunzer*. Adv. Mater. 2024, 2308497. DOI: 10.1002/adma.202308497

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