Material extrusion (ME) type 3D printing has been widely utilized through various types of systems depending on the fabrication methods, materials, and precision to fabricate complex workpieces that cannot be made with conventional methods. This study provides basic considerations in response to the current demands on performance evaluation of ME type 3D printing related to dimensions as well as the realization of the guidelines to be established in the near future. As a simple specimen for these purposes, 2D and 3D hole-plates were designed and fabricated by using a ME type entry-level 3D printer. For evaluation of dimensions on the specimen, both specimens were measured by a calibrated tool-maker’s microscope which is to length standard. The measurement parameters were the center position of the holes, the diameter of the holes, and the circularity error of the holes.
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The necessity for printing multi-materials has increased as the importance of 3D printing grew in various industries. Many studies have undertaken for printing multi-materials simultaneously. In ME (Material Extrusion) type 3D printers, the method of printing different materials using multi nozzles is generally commercialized. Polymers with different composition are hardto-mix with each other, making it difficult to maintain the structural strength of printer parts. So the MJ type 3D printer uses a unique method that mixes multi-materials in a liquid state before printing. In the ME type 3D printer, there were also efforts to mix materials in a melted state, but they were mainly demonstrated for multi-colored parts. In this study, the effect of multi-material mixing on structural strength changes was tested. Multi-Materials were printed with the ME type 3D printer by using one nozzle with a multiple filament feeding system. The bending and tensile tests were conducted to verify the structural characteristics.
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