Publications by Brett Kelly
This study continues recent work providing the first life-cycle assessment (LCA) of multiple 3D p... more This study continues recent work providing the first life-cycle assessment (LCA) of multiple 3D printers using comprehensive multi-variable impacts, and the first such comparison of additive manufacturing vs. machining. In this study, new machines were measured and the functional unit was adjusted from the making of two solid parts to making one thin-walled part, for more realistic comparison of the prototyping most often performed by 3D printers, according to industry sources. Machines measured were a Mori Seiki NVD1500 DCG CNC mill, a Haas VF0 CNC mill, an Afinia H480 desktop FDM printer, a Dimension 1200BST FDM printer, an Objet Connex 350 polyjet printer, and a Projet 6000 SLA printer. Scoring used ReCiPe Endpoint H. Printer usage varies widely, so scenarios included theoretically making parts 24 hrs/day, 7 days/wk, as well as making just one part per week, either leaving machines idling or turning them off when not in use.
Papers by Brett Kelly
Image Sensing Technologies: Materials, Devices, Systems, and Applications V
Science advances, 2017
Two limitations of additive manufacturing methods that arise from layer-based fabrication are slo... more Two limitations of additive manufacturing methods that arise from layer-based fabrication are slow speed and geometric constraints (which include poor surface quality). Both limitations are overcome in the work reported here, introducing a new volumetric additive fabrication paradigm that produces photopolymer structures with complex nonperiodic three-dimensional geometries on a time scale of seconds. We implement this approach using holographic patterning of light fields, demonstrate the fabrication of a variety of structures, and study the properties of the light patterns and photosensitive resins required for this fabrication approach. The results indicate that low-absorbing resins containing ~0.1% photoinitiator, illuminated at modest powers (~10 to 100 mW), may be successfully used to build full structures in ~1 to 10 s.
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Publications by Brett Kelly
Papers by Brett Kelly