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Proceedings Paper

Photo-polymerization based endoscopic multi-layer printing system
Author(s): Marcel Nassif; Erwan Dupont; Hani Al Hajjar; Frédéric Lamarque
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Paper Abstract

This article presents an endoscopic 3D printer using the photo-polymerization additive method. The proposed endoscopic principle allows printing 3D objects through a flexible optical image guide. The concept is first to transmit a pattern using ultraviolet light projected through the endoscopic optical system on the printing surface. A layer by layer printing is performed by moving the focusing plane along the z-axis. The endoscopic optical design is based on a Digital Micro-Mirror (DMD) projector, an image guide (a fiber bundle of 70 000 fibers) and optical lenses. It is modeled and simulated using the Zemax optical software. The projected pattern from the DMD is injected into the image guide. Then, the pattern is refocused on the printing surface, which is the transparent bottom of a vat full of resin. First, optical losses and homogeneity of the endoscopic optical system are measured. Then, photopolymer parameters of used resin (Formlab RS-F2-GPWHH-04) are experimentally evaluated. Finally, different multi-layer objects (typically 30 layers) are printed to validate the concept of 3D endoscopic fabrication. Using a 405 nm LED, an optical irradiance of 1.7 mW/cm² on the printing surface is reached. 3D parts are printed with a lateral resolution of 150 μm and a layer thickness of 100 μm on a circular printing surface of 9.54 mm diameter.

Paper Details

Date Published: 28 February 2020
PDF: 6 pages
Proc. SPIE 11292, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XIII, 112921A (28 February 2020); doi: 10.1117/12.2541913
Show Author Affiliations
Marcel Nassif, Roberval Lab., CNRS, Sorbonne Univ., Univ. de Technologie Compiègne (France)
Erwan Dupont, Roberval Lab., CNRS, Sorbonne Univ., Univ. de Technologie Compiègne (France)
Hani Al Hajjar, Roberval Lab., CNRS, Sorbonne Univ., Univ. de Technologie Compiègne (France)
Frédéric Lamarque, Roberval Lab., CNRS, Sorbonne Univ., Univ. de Technologie Compiègne (France)


Published in SPIE Proceedings Vol. 11292:
Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XIII
Georg von Freymann; Eva Blasco; Debashis Chanda, Editor(s)

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