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Development of a large size 3D delta printer for advanced polymers
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Resumo(s)
Additive Manufacturing has been extensively used in the last years
for prototyping and small series production of functional parts. One of the most
popular processes is material extrusion, where a material is extruded through a
nozzle, being the part created layer by layer. In this work, an advanced 3D printer
is presented, build by the authors, based in a Delta Robot configuration, able to
produce parts with 400 mm diameter and up to 850 mm height. The chosen concept provides a very stiff structure with ease of access to all components. A high
temperature water-cooled print head (that can reach 500 °C) and a closed heated
chamber makes this printer able to produce large size parts with some advanced
thermoplastic materials. To improve accuracy, a new sensor based in a load cell
with specific signal conditioning is proposed for z-probe and to accurately determine some characteristics of the Delta mechanism. The principal features of this
new sensor are compared with a previous assembled sensor (IR). A careful assembly and non-clearance mechanisms with the new sensor proposed are expected to
improve print quality.