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MODIFICATION OF THE NOZZLE ASSEMBLY IN A 3D PRINTER FOR PRINTING MATERIALS WITH HIGHER MELTING TEMPERATURES

Ing. Antonin Durna, Ing. Jiri Fries Ph.D.

Abstract

This article deals with the modification of the nozzle and its entire assembly with a hot end, so that it was not necessary to use a tephlon insertion and it was possible to reach the maximum temperatures of the nozzle reaching 280пїЅC and above. With the gradual development of 3D printing technology FDM (fused deposition modeling), i.e. the fritting of the thermoplastic in the shape of the fibres and putting it into the layers, more demands are placed on the materials used. Materials with a greater temperature of glass transition are more resistant to mechanical stress at a higher temperature. Commonly used materials have a temperature of melting, in accordance with the material used, ranging from 190пїЅC to 250пїЅC. Frequently used nozzles for 3D printers enable covering this temperature range, while this temperature is influenced by the tephlon insertion, which serves as insulation. At higher temperatures and during the long printing period, when the nozzle is gradually heated up thanks to its poor cooling, or thanks to its overall construction, there is the risk of melting the printing materials even in the cooler compartment, its gradual cooling and subsequent jams. This problem has then a decisive influence on the quality of the product. Thanks to such adjustments these 3D printers can produce good quality and more durable products, meeting the demands that are required in the case of simple components, e.g. for the aeronautical but also for the aerospace industry, where it is not possible to produce parts using any conventional technology.

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DOI resolver: doi.org/10.5593/sgem2017/62/s28.118

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