Abstract
The objective of the present work is to study the raster generation to realize Fused Filament Fabrication parts. The research in this paper focused on the evaluation of the deposition of a simple geometry with a FFF machine, supported by an analytical model to compute the build time, also evaluating the geometrical variations caused by changes in process parameters. The main parameters were the print temperature and speed as a function of the thermal and rheological properties of the PLA filament. The study identified essential correlations between process parameters, raster dimensions, and filament properties. An experimental procedure, supported by an analytical model, was implemented for computing raster time and material dimensions.
Highlights
Fused Filament Fabrication (FFF) is the most widespread AM processes used for thermoplastic prototypes, tools, and low- volume products
The research in this paper focused on the evaluation of the deposition of a simple raster geometry with a FFF machine, supported by an analytical model to compute the build time
The realistic display of the 3D surface topographies revealed that the raster produced with the lowest speed and the highest temperature led to the highest height values
Summary
Fused Filament Fabrication (FFF) is the most widespread AM processes used for thermoplastic prototypes, tools, and low- volume products It is a new name for Fused Deposition Modeling, an extrusion-based process in which products are realized by melting polymer-based filaments and depositing molten materials on a horizontal build platform. Focusing on the specific polymer such as Polylactic Acid (PLA), this is characterized by a higher cost of production compared to petroleum-derived, non-biodegradable materials whereas it is inherently brittle, despite its tunable tacticity, microstructure, and mechanical properties These features limit the use of PLA in a wide range of short-term applications [4]. The study identified essential correlations between process parameters, raster dimensions, and filament properties
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