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Proceedings of CAD'17, 2017, 186-190
Printability Analysis in Additive Manufacturing
Abstract. An important issue in Additive Manufacturing (AM), which to this date is still not well controlled, is predicting the build accuracy and its relationship to the total build time. For example, in Fusion Deposition Modeling, the accuracy of the as-manufactured geometry can be partially controlled in-process by choosing a convenient in-fill pattern or modulating the printing head speed and nozzle temperature around small area features. Though, the effects of this process optimization are ultimately limited by the kinematic configuration of the AM machine as well as by the geometry and size of the extruder. These factors have the greatest potential for improving the build accuracy and, specifically, without negatively impacting the build time. The nozzle’s shape has been traditionally constrained, unnecessarily, to a circular shape. On the other hand, the smallest printable feature, or print resolution, is fundamentally limited by both the shape and dimensions of this extruder. This resolution can be improved locally in-process by filament flow rate or under/over extrusion, but the extruder geometry remains the largest contributing factor to the build accuracy. We present a generic methodology for computing the as-manufactured geometry in additive manufacturing, which, in turn, provides a ranking of given nozzle geometries in terms of their corresponding build accuracy and subsequently build time.
Keywords. Additive Manufacturing, Fusion Deposition Modeling, Solid sweeps, Build accuracy, Inverse Trajectory, Multi-Parametric Motion