2007 International Solid Freeform Fabrication Symposium
Proceedings for the 2007 International Solid Freeform Fabrication Symposium. For more information about the symposium, please see the Solid Freeform Fabrication website .
The Seventeenth Solid Freeform Fabrication (SFF) Symposium, held at The University of Texas in Austin on August 6-8, 2007, was attended by almost 100 national and international researchers from 8 countries. Papers addressed SFF issues in computer software, machine design, materials synthesis and processing, and integrated manufacturing. The diverse domestic and foreign attendees included industrial users, SFF machine manufacturers, university researchers and representatives from the government. The Symposium organizers look forward to its being a continuing forum for technical exchange among the expanding body of researchers involved in SFF.
The Symposium was again organized in a manner to allow the multi-disciplinary nature of the SFF research to be presented coherently, with various sessions emphasizing process development, design tools, modeling and control, process parameter optimization, applications and materials. We believe that documenting the changing state of SFF art as represented by these Proceedings will serve both those presently involved in this fruitful technical area as well as new researchers and users entering the field.
Two special themes for this year’s conference included an industrial perspective and design. For the former, Terry Wohlers of Wohlers Associates presented an overview of the state of the art in industrial practice and was followed by a panel presentation on perspectives by Joe Beaman (University of Texas at Austin), Brent Stucker (Utah State University) and Neil Hopkinson (Loughborough University). The special session on Design was organized by Carolyn Seeperesad. Presentations explored design tools, fundamental research and applications in biomedical, aerospace and automotive.
This year’s best oral presentation was given by David Rosen of Georgia Institute of Technology. Selection is based on the overall quality of the paper, the presentation and discussion at the meeting, the significance of the work and the manuscript submitted to the proceedings. The paper title was, “Design for Additive Manufacturing: A Method to Explore Unexplored Regions of the Design Space”. Selected from 55 oral presentations, his presentation appears on Page 402 of this Proceedings. The best poster presentation selected from 6 posters was given by Omer Cansizoglu of North Carolina State University (co-authors Ola L.A. Harrysson, Denis J. Marcellin-Little, Denis R. Cormier, Harvey A. West II). The paper title was, “Tailored Structures to Reduce Stress Shielding in Hip Implants.”
The editors would like to extend a warm “Thank You” to Rosalie Foster for her detailed handling of the logistics of the meeting and the Proceedings, as well as her excellent performance as registrar and problem solver during the meeting. We would like to thank the Organizing Committee, the session chairs, the attendees for their enthusiastic contributions, and the speakers both for their significant contribution to the meeting and for the relatively prompt delivery of the manuscripts comprising this volume. We look forward to the continued close cooperation of the SFF community in organizing the Symposium. We also want to thank the Office of Naval Research (N00014-07-1-0970) and the National Science Foundation (CMMI-0728118) for supporting this meeting financially. The meeting was co-organized by the University of Connecticut at Storrs, and the Mechanical Engineering Department, Laboratory for Freeform Fabrication and the Texas Materials Institute at The University of Texas at Austin.
Recent Submissions
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Topology Design and Freeform Fabrication of Deployable Structures with Lattice Skins
(2007)Solid freeform fabrication is particularly suitable for fabricating customized parts, but it has not been used for fabricating deployable structures that can be stored in a compact configuration and deployed quickly and ... -
Manufacturing Metallic Parts with Designed Mesostructure via Three-Dimensional Printing of Metal Oxide Powder
(2007-09-05)Cellular materials, metallic bodies with gaseous voids, are a promising class of materials that offer high strength accompanied by a relatively low mass. In this paper, the authors investigate the use of ThreeDimensional ... -
Printing Food
(2007-08-21)This paper examines the possible applications of food as a raw material in freeform fabrication, and provides several demonstrations of edible three-dimensional objects. The use of edible materials offers several advantages: ... -
Layered Fabrication of Branched Networks Using Lindenmayer Systems
(2007)A current challenge impeding the growth of bone tissue engineering is the lack of functional scaffolds of geometric sizes greater than 10mm due to the inability of cells to survive deep within the scaffold. It is ... -
Accuracy and Mechanical Properties of Open-Cell Microstructures Fabricated by Selective Laser Sintering
(2007)This paper investigates the applicability of selective laser sintering (SLS) for the manufacture of scaffold geometries for bone tissue engineering applications. Porous scaffold geometries with open-cell structure and ... -
Deposition of Ti/TiC Composite Coatings on Implant Structures Using Laser Engineered Net Shaping
(2007-09-05)A new method of depositing hard and wear resistant composite coatings on metal-onmetal bearing surfaces of titanium implant structures is proposed and demonstrated. The method consists of depositing a Ti/TiC composite ... -
Freeform Fabrication of a Complete Electrochemical Relay
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Printing Embedded Circuits
(2007-09-05)Automated manufacturing technologies such as freeform fabrication can greatly reduce the cost and complexity of infrastructure required to manufacture unique devices or invent new technologies. Multi-material freeform ... -
Laser Sintering Fabrication of Highly Porous Models Utilizing Water Leachable Filler-Experimental Investigation into Process Parameters
(2007)The authors are developing a laser sintering process to fabricate highly porous models with such high porosities as 90% and more. In the process, water-soluble filler is mixed with designated plastic powder and leached ... -
The Use of Layered Freeform Fabrication Technologies to Produce Tissue Engineering Scaffolds for Skull Patches
(2007-09-04)Congenital skull defects in infants are difficult to correct using metal plates due to the growth of the skull. Tissue engineering of bone patches could be the answer to help such patients. Custom scaffolds have been ... -
Analysis of the Effects of 3DP Parameters on Part Feature Dimensional Accuracy
(2007)3D printing (3DP) is a widely investigated scaffold manufacturing process for Tissue Engineering (TE). Useful scaffold geometries should have high porosity (60-80%) with small (100-500 μm) interconnected pores. Therefore ... -
Multi-Material Stereolithography: Spatially-Controlled Bioactive Poly(Ethylene Glycol) Scaffolds for Tissue Engineering
(2007-08-27)Challenges remain in tissue engineering to control the spatial and temporal mechanical and biochemical architectures of scaffolds. Unique capabilities of stereolithography (SL) for fabricating multi-material spatially-controlled ... -
Freeform Fabrication of Biological Scaffolds by Projection Photopolymerization
(2007-09-04)This article presents a micro-manufacturing method for direct, projection printing of 3- dimensional (3D) scaffolds for applications in the field of tissue engineering by using a digital micro-mirror-array device (DMD) ... -
Automated Design of Tissue Engineering Scaffolds by Advanced CAD
(2007)The design of scaffolds with an intricate and controlled internal structure represents a challenge for Tissue Engineering. Several scaffold manufacturing techniques allow the creation of complex and random architectures, ... -
LENS® and SFF: Enabling Technologies for Optimized Structures
(2007)Optimized, lightweight, high-strength structures are needed in many applications from aerospace to automotive. In pursuit of such structures, there have been proposed analytical solutions and some specialized FEA solutions ... -
Multiscale Design for Solid Freeform Fabrication
(2007)One of the advantages of solid freeform fabrication is the ability to fabricate complex structures on multiple scales, from the macroscale features of an overall part to the mesoscale topology of its internal architecture ... -
Design for Additive Manufacturing: A Method to Explore Unexplored Regions of the Design Space
(2007)Additive Manufacturing (AM) technologies enable the fabrication of parts and devices that are geometrically complex, have graded material compositions, and can be customized. To take advantage of these capabilities, it ... -
Comparison of Material Properties and Microstructure of Specimens Built Using the 3D Systems Vanguard HS and Vanguard HiQ+HSSLS Systems
(2007)The HiQ upgrade to the 3D Systems Vanguard selective laser sintering (SLS) machine incorporates a revised thermal calibration system and new control software. The paper compares the tensile modulus, tensile strength, ... -
Effect of Surface Preparation Methods on Mechanical Properties of 3D Structures Fabricated by Stereolithography and 3D Printing for Electroless Ni Plating
(2007)Stereolithography (SL) and 3D Printing (3DP) are useful technologies for three-dimensional prototyping applications, providing highly accurate and detailed part geometries with high quality surface finishes. It is desired ...