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Material extrusion (ME) is a low-cost additive manufacturing (AM) technique that is capable of producing metallic components using desktop 3D printers through a three-step printing, debinding and sintering process to obtain fully dense metallic parts. However, research on ME AM, specifically fused filament fabrication (FFF) of 316L SS, has mainly focused on improving densification and mechanical properties during the post-printing stage; sintering parameters. Therefore, this study aims to investigate the effect of varying processing parameters during the initial printing stage, specifically nozzle temperatures, T_n (190°C–300°C) on the relative density, porosity, microstructures and microhardness of FFF 3D printed 316L SS.

Cube samples (25 x 25 x 25 mm) are printed via a low-cost Artillery Sidewinder X1 3D printer using a 316L SS filament comprising of metal-polymer binder mix by varying nozzle temperatures from 190 to 300°C. All samples are subjected to thermal debinding and sintering processes. The relative density of the sintered parts is determined based on the Archimedes Principle. Microscopy and analytical methods are conducted to evaluate the microstructures and phase compositions. Vickers microhardness (HV) measurements are used to assess the mechanical property. Finally, the correlation between relative density, microstructures and hardness is also reported.

The results from this study suggest a suitable temperature range of 195°C–205°C for the successful printing of 316L SS green parts with high dimensional accuracy. On the other hand, T_n = 200°C yields the highest relative density (97.6%) and highest hardness (292HV) in the sintered part, owing to the lowest porosity content (<3%) and the combination of the finest average grain size (∼47 µm) and the presence of Cr23C6 precipitates. However, increasing T_n = 205°C results in increased porosity percentage and grain coarsening, thereby reducing the HV values. Overall, these outcomes suggest that the microstructures and properties of sintered 316L SS parts fabricated by FFF AM could be significantly influenced even by adjusting the processing parameters during the initial printing stage only.

This paper addresses the gap by investigating the impact of initial FFF 3D printing parameters, particularly nozzle temperature, on the microstructures and physical characteristics of sintered FFF 316L SS parts. This study provides an understanding of the correlation between nozzle temperature and various factors such as dimensional integrity, densification level, microstructure and hardness of the fabricated parts.

This study aims to identify the factors to food safety certification adoption among farmers in Malaysia.

This study was conducted qualitatively using a method of interviewing with unstructured questions. To identify the factors that influence and prevent the adoption of food safety certification among Malaysian farmers, nine (n = 9) agricultural industrial experts were randomly chosen.

Based on data analysis using thematic analysis, the respondent highlighted 14 factors to food safety certification. Specifically, the most frequent determinant highlighted by the respondent is enforcement (12). Additionally, it has been proven that the identified factors aligned with existing theories: technology, organization and environment (TOE) framework and eco-innovation theory. These theories help researchers to create effective strategies and produce significant findings from their research.

To the best of the authors’ knowledge, this study is the first to investigate food safety certification adoption among farmers in the Malaysian agriculture industry using the integration of the TOE framework and eco-innovation theory. The stakeholder is expected to receive the benefits of creating efficient campaigns to encourage more farmers to obtain food safety certification. This study provides further knowledge by improving the understanding of the processes involved in certification adoption, providing context-specific insights, best practices, policy guiding development and emphasizing the effects of certification on sustainability and competitiveness.