Fused Filament Fabrication (FFF) is the most used additive manufacturing (AM) technique. Understanding the behavior of the in situ temperature profile during the cooling stage is crucial to enhancing the mechanical properties of the parts manufactured by FFF since adhesion between printed layers is strongly related to the polymer cooling rate. However, only some studies analyze each layer in detail. For such analysis, infrared thermographic cameras can be used as a tool for non-contact temperature measurement. Numerous variables in constructing the part offer potential for such investigation. This study may lead to the enhancement of the part manufactured and improvements in the 3D printer itself. In addition, the polymer matrix and the manufacturing software can also be optimized. This work aims to systematically evaluate the temperature profile along the deposited layers during the fabrication of three-dimensional parts using poly(lactic acid) (PLA) filament. An infrared camera was used for real-time temperature measurements, and the data were processed with MATLAB^® as a function of time and part length. A difference of up to 30 °C was observed between the edges, and non-uniform temperature profiles were also observed at the beginning, middle, and end of the part manufacturing. The highest temperatures were observed at the side where the print nozzle positions itself for the base to descend to the next layer. Several strategies are proposed to enhance the temperature distribution during the cooling process.

Bombas centrífugas são amplamente utilizadas nos mais diversos setores, como industrial, agrícola, residencial, dentre outros. Em algumas aplicações, esses dispositivos são usados continuamente, resultando em uma parcela significativa do consumo energético. Portanto, melhorar a eficiência desses dispositivos é de grande benefício para a redução de custos. O presente trabalho utilizou a técnica de fluidodinâmica computacional (CFD) para projetar o impelidor de uma turbobomba, de forma a obter a máxima altura manométrica para o fluido sendo bombeado. O software Ansys® foi utilizado para a obtenção dos resultados simulados utilizando o modelo de turbulência κ-ε. Neste trabalho não foi considerada a interação do impelidor com a carcaça. Os parâmetros geométricos e o número de pás de um impelidor pré-definido foram alterados para obter a configuração que fornecesse o maior head. Um aumento de aproximadamente 12 % no head fornecido pelo impelidor foi obtido quando o número de pás no impelidor foi aumentada de 6 para 13.

The utilization of waste, defined as commercially worthless or discarded material, is becoming an increasingly important topic in the context of environmental material overload. Thus, the development of new products should integrate waste, adding commercial value to materials that would have otherwise been discarded. In this context, Material Extrusion (ME), the most widely used technique in Additive Manufacturing (AM), has introduced a new manufacturing model, opening opportunities for developing innovative products. On the other hand, during the beneficiation process of ornamental rocks, tons of mineral waste are generated. This study aims to develop a polylactic acid (PLA) filament using Beige Bahia marble waste as a raw material source via the ME technique. Compositional mapping through Energy Dispersive Spectroscopy (EDS) indicated that, as the mass fraction increased, particle clustering within the PLA matrix decreased. Mass compositions ranging from 0–30% mineral waste to PLA were evaluated. Gel Permeation Chromatography (GPC) showed that the PLA molar mass in the PLA00 and PLA30 compositions was 109,103 and 120,103 g.mol⁻¹, respectively, indicating that the mineral waste helped preserve the polymer’s molar mass during material processing. An increase was observed in the elastic modulus. The total roughness profile demonstrated higher values for pure PLA, while the partial roughness profile showed higher noise due to the greater presence of particles on the surface. The final product exhibited characteristics like the original rock and could serve as an alternative when such features are desired.