A study to investigate the effect of 3D printing quality on the aerodynamic characteristics and flow transition from laminar to turbulent

Purpose A three-dimensional (3D) printing error simulation approach is proposed to analyze the influence of tilted vertical beams on the 3D printing accuracy. The purpose of this study is to analyze the influence of such errors on printing accuracy and printing quality for delta-robot 3D printer. Design/methodology/approach First, the kinematic model of a delta-robot 3D printer with an ideal geometric structure is proposed by using vector analysis. Then, the normal kinematic model of a nonideal delta-robot 3D robot with tilted vertical beams is derived based on the above ideal kinematic model. Finally, a 3D printing error simulation approach is proposed to analyze the influence of tilted vertical beams on the 3D printing accuracy. Findings The results show that tilted vertical beams can indeed cause 3D printing errors and further influence the 3D printing quality of the final products and that the 3D printing errors of tilted vertical beams are related to the rotation angles of the tilted vertical beams. The larger the rotation angles of the tilted vertical beams are, the greater the geometric deformations of the printed structures. Originality/value Three vertical beams and six horizontal beams constitute the supporting parts of the frame of a delta-robot 3D printer. In this paper, the orientations of tilted vertical beams are shown to have a significant influence on 3D printing accuracy. However, the effect of tilted vertical beams on 3D printing accuracy is difficult to capture by instruments. To reveal the 3D printing error mechanisms under the condition of tilted vertical beams, the error generation mechanism and the quantitative influence of tilted vertical beams on 3D printing accuracy are studied by simulating the parallel motion mechanism of a delta-robot 3D printer with tilted vertical beams.

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Effect of copper or carbon fiber addition to the 3D printing of polylactid samples

Materials Testing ◽

10.1515/mt-2020-620711 ◽

2020 ◽

Vol 62 (7) ◽

pp. 727-732

Author(s):

L. Zárybnická ◽

D. Machová ◽

K. Dvořák

Keyword(s):

3D Printing ◽

Fused Deposition Modeling ◽

Depth Of Field ◽

3D Print ◽

Fused Deposition ◽

Printing Quality ◽

Digital Microscope ◽

Effect Of Copper ◽

The Right

Abstract This paper presents the effect of additives on the quality of a product created by 3D print. The product is created by the most widely used 3D printing method - Fused Deposition Modeling (FDM). Polylactic acid (PLA) filaments are tested without and with the addition of carbon fibers or copper. The specimens are characterized by different methods, such as mechanical testing, measuring roughness by digital microscope with a large depth of field and thermal analysis. In fact, FDM is a problematic process with numerous criterions that affect printing quality. Printing parameters such as print temperature, pad temperature, print speed for 3D printing, printing orientation etc. have an important impact on the performance and quality of FDM components. Due to the correct parameters, the product of the required quality with a longer service life is obtained. The results of testing show that the quantity and choice of the right ingredient has a major impact on the mechanical properties and overall quality of the investigated product.

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Impact of microbial transglutaminase on 3D printing quality of Scomberomorus niphonius surimi

LWT ◽

10.1016/j.lwt.2020.109123 ◽

2020 ◽

Vol 124 ◽

pp. 109123 ◽

Cited By ~ 1

Author(s):

Xiuping Dong ◽

Yuxi Pan ◽

Wenyu Zhao ◽

Ying Huang ◽

Wenhui Qu ◽

...

Keyword(s):

3D Printing ◽

Microbial Transglutaminase ◽

Printing Quality ◽

Scomberomorus Niphonius

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Effects of Filament Diameter Tolerances in Fused Filament Fabrication

IU Journal of Undergraduate Research ◽

10.14434/iujur.v2i1.20917 ◽

2016 ◽

Vol 2 (1) ◽

pp. 44-47 ◽

Cited By ~ 3

Author(s):

Carolina Cardona ◽

Abigail H Curdes ◽

Aaron J Isaacs

Keyword(s):

3D Printing ◽

Low Cost ◽

Acrylonitrile Butadiene Styrene ◽

Fused Filament Fabrication ◽

Important Indicator ◽

Extrusion Rate ◽

Filament Diameter ◽

Printing Quality ◽

3D Printers ◽

And Control

Fused filament fabrication (FFF) is one of the most popular additive manufacturing (3D printing) technologies due to the growing availability of low-cost desktop 3D printers and the relatively low cost of the thermoplastic filament used in the 3D printing process. Commercial filament suppliers, 3D printer manufacturers, and end-users regard filament diameter tolerance as an important indicator of the 3D printing quality. Irregular filament diameter affects the flow rate during the filament extrusion, which causes poor surface quality, extruder jams, irregular gaps in-between individual extrusions, and/or excessive overlap, which eventually results in failed 3D prints. Despite the important role of the diameter consistency in the FFF process, few studies have addressed the required tolerance level to achieve highest 3D printing quality. The objective of this work is to develop the testing methods to measure the filament tolerance and control the filament fabrication process. A pellet-based extruder is utilized to fabricate acrylonitrile butadiene styrene (ABS) filament using a nozzle of 1.75 mm in diameter. Temperature and extrusion rate are controlled parameters. An optical comparator and an array of digital calipers are used to measure the filament diameter. The results demonstrate that it is possible to achieve high diameter consistency and low tolerances (0.01mm) at low extrusion temperature (180 °C) and low extrusion rate (10 in/min).

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A Multi(two)-Nozzle Cable-Driven Parallel Robot For 3D Printing Building Construction: Path Optimization and Vibration Analysis

10.21203/rs.3.rs-1036880/v1 ◽

2021 ◽

Author(s):

Sy Nguyen-Van ◽

Kwan-Woong Gwak

Keyword(s):

3D Printing ◽

Vibration Analysis ◽

Optimal Path ◽

Parallel Robot ◽

Building Construction ◽

Element Formulation ◽

B Splines ◽

Printing Quality ◽

Travel Length ◽

Printing Time

Abstract This paper proposes a multi-nozzle cable-driven parallel robot for 3D printing building construction. This system has two independently moving nozzles mounted on the existing printing head. The printing time can be reduced dramatically with this system as the travel path of the printing head can be reduced to almost half thanks to those two nozzles that print almost half of the printing contour. To fully take advantage of two nozzle structures effectively, the path of the printing head is optimized to secure the minimum travel length of both the printing head and two nozzles. The smoothness of the optimal path is secured by applying the non-uniform rational B-splines (NURBS). In addition, free vibration of the proposed CDPR printer’s structure is analyzed to improve the printing quality and help the control of the proposed CDPR plain by using a finite element formulation of cables of the proposed robot.

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Parameter Design of a Pneumatic Dispensing 3D Printing System for Soft Scaffold Fabrication

Volume 4: 21st Design for Manufacturing and the Life Cycle Conference; 10th International Conference on Micro- and Nanosystems ◽

10.1115/detc2016-59680 ◽

2016 ◽

Author(s):

Wenqi Zhou ◽

Qingjin Peng

Keyword(s):

Tissue Engineering ◽

3D Printing ◽

Selection Method ◽

Parameter Design ◽

Operational Parameters ◽

Scaffold Fabrication ◽

Printing Quality ◽

Parameters Selection ◽

Printing System ◽

Regression Tests

3D printing technologies have been widely used in Tissue Engineering. The pneumatic dispensing system is one of the promising dispensing technologies to fabricate scaffolds with controllable pore sizes and porosities. There are many factors to affect the printing quality in pneumatic systems. An effective method is required to help users to systematically select proper operational parameters to print strands with desired width. In this paper, the DoE method is introduced to evaluate operational parameters and their interactions. The solution is further verified using regression tests. Based on the proposed solution, a five steps parameters selection method is proposed and verified to select operational parameters for two targeted strand widths.

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Printability Study of a Conductive Polyaniline/Acrylic Formulation for 3D Printing

Polymers ◽

10.3390/polym13132068 ◽

2021 ◽

Vol 13 (13) ◽

pp. 2068

Author(s):

Goretti Arias-Ferreiro ◽

Ana Ares-Pernas ◽

Aurora Lasagabáster-Latorre ◽

Nora Aranburu ◽

Gonzalo Guerrica-Echevarria ◽

...

Keyword(s):

3D Printing ◽

Low Cost ◽

Electronic Devices ◽

Maximum Amount ◽

Gel Point ◽

Digital Light Processing ◽

Conductive Composites ◽

Printing Quality ◽

Conductive Polyaniline ◽

Pure Resin

There is need for developing novel conductive polymers for Digital Light Processing (DLP) 3D printing. In this work, photorheology, in combination with Jacobs working curves, efficaciously predict the printability of polyaniline (PANI)/acrylate formulations with different contents of PANI and photoinitiator. The adjustment of the layer thickness according to cure depth values (Cd) allows printing of most formulations, except those with the highest gel point times determined by photorheology. In the working conditions, the maximum amount of PANI embedded within the resin was ≃3 wt% with a conductivity of 10−5 S cm−1, three orders of magnitude higher than the pure resin. Higher PANI loadings hinder printing quality without improving electrical conductivity. The optimal photoinitiator concentration was found between 6 and 7 wt%. The mechanical properties of the acrylic matrix are maintained in the composites, confirming the viability of these simple, low-cost, conductive composites for applications in flexible electronic devices.

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Effects of Pea Protein on the Properties of Potato Starch-Based 3D Printing Materials

International Journal of Food Engineering ◽

10.1515/ijfe-2017-0297 ◽

2018 ◽

Vol 14 (3) ◽

Cited By ~ 11

Author(s):

Feng Chuanxing ◽

Wang Qi ◽

Li Hui ◽

Zhou Quancheng ◽

Meng Wang

Keyword(s):

3D Printing ◽

Chemical Structure ◽

Potato Starch ◽

Textural Properties ◽

Theoretical Research ◽

X Ray Diffraction ◽

Scanning Calorimetry ◽

Pea Protein ◽

X Ray ◽

Printing Quality

AbstractSince materials are the substantial foundation for 3D printing, the lack of theoretical research on 3D printing food materials restricts the development of 3D printing in food field. Based on the principle of 3D starch gelatinization printing, this study revealed the effects of pea protein on the printability of potato starch-based 3D printing materials in granular structure, crystalline structure, chemical structure, textural properties, and thermal properties, through scanning electron microscope, X-ray diffraction, Fourier-transformed infrared, differential scanning calorimetry, and textural method, and developed new food materials for 3D printing. The study indicated the structural properties and physicochemical properties changed regularly with the increase in the content of pea protein, when the content of pea protein was 1%, the printing quality was best. The study provides a new theory for the application of 3D printing in food production and technical support for actual production.

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Effects of Paper on 3D Printing Quality in UV Ink-Jet Printing

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.731.312 ◽

2015 ◽

Vol 731 ◽

pp. 312-315

Author(s):

Liu Xi He ◽

Guang Xue Chen ◽

Huan Mei Wang

Keyword(s):

3D Printing ◽

Ink Jet Printing ◽

Printing Quality ◽

Ink Jet ◽

Jet Printing

The experiment studied effects of paper on the height and glossiness of UV ink-jet 3D printing. The results showed that there all existed penetrations between the 1st ink layer and three kinds of paper, the bigger the roughness and bulk of paper were, the larger the penetration was, and penetration between the 1st ink and paper was obviously larger than that between two ink layers. Penetration between two ink layers was stable, almost not affected by paper. The bigger the roughness and bulk of paper were, the smaller the glossiness of ink layer was. There appeared directional ink strips on ink layer on three kinds of paper, beginning from the 3rd ink layer, there also appeared ink pits on ink layer on paper whose roughness and bulk were the biggest, which showed printer precision was also an important factor for the glossiness, apart from paper. Thus, the tight and smooth paper should be selected in UV ink-jet 3D printing. Before printing, pretreatment should be done to exclude the influence of the 1st ink layer and the ink strips.

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