On the Geometric Accuracy of RepRap Open-Source Three-Dimensional Printer

Lanzotti, Antonio; Giudice, Domenico Maria Del; Lepore, Antonio; Staiano, Gabriele; Martorelli, Massimo

doi:10.1115/1.4031298

Cited by 28 publications

(11 citation statements)

References 15 publications

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“…The accuracy of the part to its digital counterpart has been analysed by Sood et al [12] who applied Taguchi's design of experiments on five common parameters 1 of the FDM process and determined that the shrinkage phenomena is most influential. This has been confirmed by Lanzotti et al [13] in their study of the RepRap open-source 3D printer, which revealed that layer thickness and the consequent shrinkage was the leading factor in attaining geometrically accurate parts. It was also revealed that to optimise accuracy in all Cartesian co-ordinates generally necessitates a compromise as optimising in a single direction negatively impacts on the others.…”

Section: Related Worksupporting

confidence: 54%

Using finite element analysis to influence the infill design of fused deposition modelled parts

2017

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Additive manufacturing (AM) has and continues to experience considerable market and technological growth with many forecasting a tripling in market value over the next decade. One of the primary drivers for this growth is the increased freedom afforded to the design of both the external form and internal structure of fabricated parts. This freedom presents greater opportunities in optimising a parts mechanical properties, (such as strength, stiffness and mass), which in turn leads to enhanced performance whilst potentially reducing material use and hence, environmental impact. Realising this potential will further increase the viability of AM for a greater range of engineering contexts. Correspondingly, the contribution of this paper lies in the creation and validation of a method for the topological optimisation of the infill structure of fused deposition modelled (FDM) components. The proposed method uses results attained from finite element analysis (FEA) to influence the design of the internal structure (i.e. infill) by locally varying the composition of the infill based upon the associated stress values. This paper presents and discusses the proposed method, and demonstrates the generalisability of the method through its ability to handle complex geometries and loading conditions, and manufacturing process constraints. In addition, the paper validates the method through testing of FDM beams comprised of FEA influenced and standard honeycomb infill designs undergoing four different loading scenarios. The validation reveals that a three and a half times increase in strength can be achieved where the stress profiles are well defined within the structure. In addition, the FEA-influenced beams exhibited more consistent failure mode profiles, which maybe desirable for designing parts with specific failure mode characteristics.

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Section: Related Worksupporting

confidence: 54%

Using finite element analysis to influence the infill design of fused deposition modelled parts

2017

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“…The nozzle which has controllable diameter and speed influences the quality of the printed part and the productivity of the process [51]. Generally, raw materials are produced in 1.75-mm and 3-mm diameter filaments, and nozzle diameters are varying from 0.1 to 1 mm [30].…”

Section: Nozzlementioning

confidence: 99%

Investigation on the manufacturing variants influential on the strength of 3D printed products

Meram¹,

Sözen²

2020

Res. Eng. Struct. Mater.

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This paper investigates the manufacturing variants influential on the strength of 3D printed products. In contrast to the traditional manufacturing methods which produce the final product via removing materials from parts, in 3D printing technology the products are provided with adding layer by layer directly from a digital file. 3D printing technology due to overcoming the many difficulties and limitations of conventional fabrication approaches is a rapidly progressing technology which takes attention in many industries such as aerospace, automotive, medical and building industries. This paper aims to research the variants affecting the mechanical properties of components produced by 3D printing technologies. To reach this aim a comprehensive review was conducted to determine the various process and geometric parameters in 3D printing technologies. The conducted literature survey results indicate that besides the filament material, the nozzle speed and diameter, layer thickness, filament diameter, printing raster angle, printing pattern, temperature and infill density are parameters which influence the final product quality and mechanical properties in term of ultimate tensile strength, yield stress and elasticity modulus. It is concluded that 3D printing filament materials strength has direct affect on the strength of final product. By providing the adequate thermal behavior of the system, the cohesion between layers can be improved. Extrusion speed affects surface roughness and quality of the produced components. Nozzle diameter has a significant influence on interlayer cohesion. The honeycomb pattern due to facilitating the load transfer between layers provides higher mechanical strength. Findings of this study will guide the researchers and manufacturers to select appropriate printing parameters to produce component with optimum mechanical properties.

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“…Moreover, it is interesting to evaluate the benefits that can derive, for the study of 3D shapes of fragments initially not classifiable, from the use of automatic reconstruction and classification procedures [2][3][4]. The last ones can be included among the Virtual Prototyping Techniques widely spread from engineering to humanities fields [5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

A Statistical Approach to Simulate Instances of Archeological Findings Fragments

Renno¹,

Lanzotti²,

Papa³

2019

JAMRIS

Self Cite

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First aim of this paper is to describe a methodology developed to create virtual fragments of archeological archetypes in CAD (Computer Aided Design) environment. A simple Reverse Engineering (RE) technique was adopted to reconstruct the shape of vases allowing the archeologists, and so the CAD inexpert personnel, to use it. Moreover, another relevant aspect is the definition of a procedure to simulate shape errors on the virtual prototypes to make more realistic the results. The characteristics of the fragments to be reproduced were selected by means of Design of Experiment (DOE) techniques. So, an algorithm was implemented to simulate the shape error, related to the working operations, that represents the typical noise for the feature recognition of archeological findings. Furthermore, this algorithm can make more complex the hypotheses related to the Gaussian model of simulation of the error and can adapt the value of the shape error (i.e. increasing it) according to the data gathered in archaeological excavation. The case study was based on the definition of a catalogue of archetypes of the black Campanian vases studied and classified by the archeologist J.P. Morel. The procedure conceived was applied to five (among one hundred) vases of the virtual catalogue obtaining forty instances of fragments affected by errors and so creating virtual mock-ups of typical pieces which may be found in the archeological site considered for the case study.

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On the Geometric Accuracy of RepRap Open-Source Three-Dimensional Printer

Cited by 28 publications

References 15 publications

Using finite element analysis to influence the infill design of fused deposition modelled parts

Using finite element analysis to influence the infill design of fused deposition modelled parts

Investigation on the manufacturing variants influential on the strength of 3D printed products

A Statistical Approach to Simulate Instances of Archeological Findings Fragments

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