Effect of printing parameters on microscale geometry for 3D printed lattice structures

Kayali, Y, Ding, M, Hamdallah, S, Qi, S, Bibb, R ORCID: https://orcid.org/0000-0002-3975-389X and Gleadall, A, 2022. Effect of printing parameters on microscale geometry for 3D printed lattice structures. Materials Today: Proceedings, 70, pp. 31-37. ISSN 2214-7853

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Abstract

This study investigated the effect of manufacturing parameters on the manufacturing quality of material extrusion additive manufacturing (MEAM), specifically focusing on the microscale geometry of lattice structures built up by discrete extruded filaments. The manufacturing parameters extrusion height, printing speed and extrusion width were investigated. Square grid structures, which can be precisely characterized, were used to develop fundamental understanding that can be translated to more complicated structures in future investigations. Print paths were directly created as machine control code (GCode) using FullControl GCode Designer, bypassing the conventional multi-stage translation of a design from CAD to an STL file, to slicing software and finally to GCode. This allowed precise parametric control of all aspects of the manufacturing procedure, including aspects that would not be possible with conventional slicing software such as control over the specific order and direction of printing each line, and the offsetting of specific printed lines on each layer in the Z direction by half the layer height. The printing quality of the structures was investigated with optical microscope and X-ray micro-computed tomography (micro-CT). Microscale changes to the extruded-filament geometry were characterized before and after filament-crossing points in the square grid structure, and internal cavities were identified. Printing speed was found to be a crucial parameter that should be carefully considered for lattice structure applications that require high manufacturing quality in terms of minimizing microscale geometric defects. Offsetting crossing extrudates by half the layer-height in the Z direction resulted in more consistent microscale geometry and greatly improved quality.

Item Type:	Journal article
Publication Title:	Materials Today: Proceedings
Creators:	Kayali, Y., Ding, M., Hamdallah, S., Qi, S., Bibb, R. and Gleadall, A.
Publisher:	Elsevier
Date:	2022
Volume:	70
ISSN:	2214-7853
Identifiers:	Number Type 10.1016/j.matpr.2022.08.487 DOI S2214785322057212 Publisher Item Identifier 1805043 Other
Rights:	This is an open access article under the CCBY license (http://creativecommons.org/licenses/by/4.0/).
Divisions:	Schools > Nottingham School of Art & Design
Record created by:	Jonathan Gallacher
Date Added:	20 Sep 2023 13:30
Last Modified:	20 Sep 2023 13:30
URI:	https://irep.ntu.ac.uk/id/eprint/49768

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