Draw control for extrusion-based additive manufacturing systems
First Claim
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1. A method for improving part quality for a printed three-dimensional part, the method comprising:
- providing a print head retained by an extrusion-based additive manufacturing system, the print head comprising a nozzle; and
moving the nozzle along a substantially linear segment of a tool path at a tip height above a previous layer of the three-dimensional part while extruding a flowable material;
producing an extruded road from the extruded flowable material having a road height above the previous layer, and wherein the tip height ranges from about 150% to about 250% of the road height due at least in part to draw on the extruded road, wherein the printed three-dimensional part is substantially free of surface cresting.
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Abstract
A method for improving part quality for a printed three-dimensional part, the method comprising moving a print head nozzle along a substantially linear segment of a tool path at a tip height above a previous layer of the three-dimensional part while extruding a flowable material, and producing an extruded road from the extruded flowable material having a road height above the previous layer, where the tip height is greater than the road height due at least in part to draw on the extruded road.
86 Citations
19 Claims
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1. A method for improving part quality for a printed three-dimensional part, the method comprising:
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providing a print head retained by an extrusion-based additive manufacturing system, the print head comprising a nozzle; and moving the nozzle along a substantially linear segment of a tool path at a tip height above a previous layer of the three-dimensional part while extruding a flowable material; producing an extruded road from the extruded flowable material having a road height above the previous layer, and wherein the tip height ranges from about 150% to about 250% of the road height due at least in part to draw on the extruded road, wherein the printed three-dimensional part is substantially free of surface cresting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for improving part quality for a printed three-dimensional part, the method comprising:
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providing a print head retained by the extrusion-based additive manufacturing system, the print head comprising a nozzle; and moving the nozzle along a tool path at a first tip height above a previous layer of the three-dimensional part; extruding a flowable material from the nozzle moving at the first tip height to produce a first portion of an extruded road having a first amount of draw; lowering the nozzle from the first tip height to a second tip height above the previous layer at a corner vertex of the tool path; moving the nozzle along the tool path at the second tip height; extruding the flowable material from the nozzle moving at the second tip height to produce a second portion of the extruded road having a second amount of draw lower than the first amount of draw or substantially no draw. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for improving part quality for a printed three-dimensional part, the method comprising:
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providing a print head retained by an extrusion-based additive manufacturing system, the print head comprising a nozzle; and moving the nozzle along a tool path above a previous layer of the three-dimensional part; extruding a flowable material from the moving nozzle to produce an extruded road; sensing draw levels of the extruded road; and adjusting at least one extrusion setting based on the sensed draw levels to print the printed three-dimensional part substantially free of surface cresting, wherein the at least one extrusion setting is selected from the group consisting of a height of the moving nozzle, a velocity of the moving nozzle, and a volumetric flow rate of the flowable material extruded from the nozzle. - View Dependent Claims (17, 18, 19)
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Specification