Browsing by Subject "parametric design"
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Item Development of a Novel Test Artefact for Conformal Material Extrusion Printing(2022) Jalui, Sagar S.; Zargar, Seyed Hossein; Moroney, Sheila; Putz, Marcus; Taylor, Mychal; Hatch, Serah; Manogharan, GuhaAdditive manufacturing (AM) allows for free complexity. However, the layer-by-layer manufacturing method traditionally relies on a G-code input to the machine, representing 2D planar slices of each layer, which eventually combines to represent the net-shape 3D geometry. Through modification of existing slicer software, thus modifying the G-code input to the machine, non-planar (conformal) shells can be generated on top of a traditional planar scaffolding. The objective of this work is to design a novel test artifact to aid in the creation of design rules and to identify machine limitations for conformal printing. With the use of non-conventional design features using trigonometric (sine) surfaces, this test artifact would allow for deeper insights into the print quality of organic shapes made possible using a commercial, low-cost, material extrusion 3D printer. It would also enable the creation of design rules for conformal printing to push forward the true dual-Design for Additive Manufacturing (dual-DfAM) potential.Item Digital Microfluidic Design for Injection Continuous Liquid Interface Production of 3D Objects(2022) Lipkowitz, Gabriel; Samuelsen, Tim; Hsiao, Kaiwen; Dulay, Maria T.; Coates, Ian; Pan, William; Shaqfeh, Eric S.G.; DeSimone, Joseph M.In additive manufacturing, it is imperative to increase print speeds, use higher viscosity resins, and print with multiple different resins simultaneously. To this end, we introduce a new UV-based photopolymerization 3D printing process exploiting a continuous liquid interface—the deadzone—mechanically fed with resin at elevated pressures through microfluidic channels dynamically created and integral to the growing part. Through such mass transport control, injection continuous liquid interface production, or iCLIP, accelerates printing speeds 5 to 10-fold over current methods such as continuous liquid interface production (CLIP), can utilize resins an order of magnitude more viscous than can CLIP, and can readily pattern a single heterogeneous object with different resins in all Cartesian coordinates. We characterize the process parameters governing iCLIP and demonstrate use-cases for rapidly printing carbon nanotube-filled composites, multi-material features with length scales spanning several orders of magnitude, and lattices with tuneable moduli and energy absorption.