Process and material behavior modeling for a new design of micro-additive fused deposition

Conductive 3D microstructures by direct 3D printing of polymer/carbon nanotube nanocomposites via liquid deposition modeling

“…On the other hand, FDM has recently become fairly popular especially among non-specialized personnel as it represents a very cost effective approach to produce 3D objects with a relatively good resolution, which can approach 40 µm [5]. However, being a thermallydriven process that requires melting of a thermoplastic filament prior to the additive deposition of the extruded feature, it exhibits some limitations related to the materials to deposit, as only relatively few polymers possess the right thermal and rheological properties to be easily processable with this technology (with poly(lactic acid) -PLA and acrylonitrile-butadiene-styrene -ABS being among the most widely employed) [6]. Recently, the FDM approach was shown to allow a high degree of orientation of short reinforcing fibers in polymer-based composites during filament extrusion, resulting in 3D printed components with unique structural properties that can significantly exceed those of traditional compression molded samples [7].…”

Facile fabrication of helical microfluidic channel based on rope coiling effect

“…An interesting phenomenon here is that the wire diameter is always larger than the size of the nozzle diameter. This phenomenon is attributed to the die swelling (Bellini 2002), which usually happens in the extrusion of molten polymers mainly due to the storage and dissipation of elastic deformation energy, where however some reversible deformations are partially recovered when the polymer is extruded out of the nozzle completely (Monzón et al 2013). The die swelling phenomenon is illustrated in Fig.…”

Characterization, modeling and simulation of fused deposition modeling fabricated part surfaces

“…Therefore, two different patterns of skewness are formed at zero inclinations result in some peaks formed along with 0.254 mm layers than 0.178 mm layers as shown in figure 11. Apart from this, material flow problem and the surface defect uncertainty at zero build orientations surface is much higher than the surfaces along with inclined or vertical surfaces [46][47][48]. Therefore, in the FDM process, these types of random pattern are rising due to the surface defects, materials flow, hardware and software limitations.…”