A study on extruded filament bonding in fused filament fabrication

Ana Elisa Costa (IPC/i3N – Institute for Polymers and Composites, Department of Polymer Engineering, University of Minho, Guimarães, Portugal)
Alexandre Ferreira da Silva (CMEMS-UMinho – Center of Electro Mechanical Systems, University of Minho, Guimarães, Portugal)
Olga Sousa Carneiro (IPC/i3N – Institute for Polymers and Composites, Department of Polymer Engineering, University of Minho, Guimarães, Portugal)

Rapid Prototyping Journal

ISSN: 1355-2546

Publication date: 8 April 2019

Abstract

Purpose

The performance of parts produced by fused filament fabrication is directly related to the printing conditions and to the rheological phenomena inherent to the process, specifically the bonding between adjacent extruded paths/raster. This paper aims to study the influence of a set of printing conditions and parameters, namely, envelope temperature, extrusion temperature, forced cooling and extrusion rate, on the parts performance.

Design/methodology/approach

The influence of these parameters is evaluated by printing a set of test specimens that are morphologically characterized and mechanically tested. At the morphological level, the external dimensions and the voids content of the printed specimens are evaluated. The bonding quality between adjacent extruded paths is assessed through the mechanical performance of test specimens, subjected to tensile loads. These specimens are printed with all raster oriented at 90º relative to the tensile axis.

Findings

The best performance, resulting from a compromise between surface quality, dimensional accuracy and mechanical performance, is achieved with a heated printing environment and with no use of forced cooling. In addition, for all the conditions tested, the highest dimensional accuracy is achieved in dimensions defined in the printing plane.

Originality/value

This work provides a relevant result as the majority of the current printers comes without enclosure or misses the heating and envelope temperature control systems, which proved to be one of the most influential process parameter.

Keywords

Citation

Ana Elisa Costa, Alexandre Ferreira da Silva and Olga Sousa Carneiro (2019) "A study on extruded filament bonding in fused filament fabrication", Rapid Prototyping Journal, Vol. 25 No. 3, pp. 555-565

Download as .RIS

DOI

: https://doi.org/10.1108/RPJ-03-2018-0062

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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