Optimisation of Process Parameters on Compressive Strength of 3D-Printed Polylactic Acid Parts

Abstract

Purpose: The purpose of this work is to optimise the influence of 3D printing processing parameters on the ultimate compressive strength of 3D-printed polylactic acid (PLA) parts. The objective is to develop the predictive models to help predict and attain optimized compressive strength integrity of 3D printed parts.
 Design/Methodology/Approach: In the present study, 3D printed PLA samples were modelled and fabricated using carefully selected processing parameters-processing speed, processing temperature and nozzle diameter. Compressive tests were performed by ASTM D695-15 standard. Two characteristics response optimisation models based on the Taguchi Technique and multi-linear regression models were developed to optimize the process parameters and the ultimate compressive strength of the 3D printed samples.
 Findings: Results of this study reveal that ultimate compressive strength is significantly affected by the Nozzle diameter. The ultimate compressive strength of the 3D-printed PLA sample was found to be significantly higher than the strength of the original PLA filament printed.
 Research Implications/Limitations: In this study, only three critical 3D printing processing parameters including, processing speed; processing temperature and nozzle diameter were implemented concurrently.
 Practical implication: By optimising process parameters, such as layer thickness, infill density, printing speed, and processing temperature, manufacturers can produce 3D-printed PLA parts with higher compressive strength. This leads to higher product quality and reliability.
 Social implication: It can empower local communities and small businesses to manufacture parts and products that meet their specific needs. This can reduce dependence on centralized manufacturing and promote economic self-sufficiency.
 Originality / Value: In this work, Nozzle diameter, which is a not too much studied 3D printing processing parameter, is implemented simultaneously with processing speed, and processing temperature to 3D print PLA filament to achieve an ultimate compressive strength value significantly higher than the strength of the original filament.