Case Illustrations of 3D Printing in Brazilian Schools and Community

2019 ◽  
pp. 158-175
Author(s):  
Manuel Marcos Maciel Formiga ◽  
Marcondes Moreira De Araujo ◽  
Ieda M. Santos
Keyword(s):  
3D Printing ◽  
Visually Impaired ◽  
Future Research ◽  
3D Printer ◽  
International Literature ◽  
Research Projects ◽  
Community Based ◽  
Extra Curricular Activities ◽  
3D Printed ◽  
Visually Impaired Students

This chapter discusses 3D printing technologies in Brazilian schools through analysis of selected cases including one case implemented in the community with implications to schools. A description of the methodology and review of the cases are presented. Analysis is supported by international literature to enrich the review and compare how the field is evolving in the country. Results indicate that students and teachers are predominantly experiencing 3D printing via extra-curricular activities supported by research projects implemented outside the schools. On the other hand, the Lite Maker project made it possible to bring a 3D printer to schools. The community-based project illustrates how 3D printed objects can support visually impaired students. 3D printing technology is moving slowly into the mainstream of Brazilian educational landscape. However, schools will increase access to this technology as printers and its accessories become more affordable. Implications for practice and future research are discussed.

An overview on joining/welding as post-processing technique to circumvent the build volume limitation of an FDM-3D printer

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Vivek Kumar Tiwary ◽  
Arunkumar P. ◽  
Vinayak R. Malik
Keyword(s):  
3D Printing ◽  
Literature Review ◽  
Adhesive Bonding ◽  
Business Leaders ◽  
Future Research ◽  
3D Printer ◽  
Content Type ◽  
Friction Stir ◽  
Fused Deposition ◽  
3D Printed

Purpose Three-dimensional (3D) printing, one of the important technological pillars of Industry 4.0, is changing the landscape of future manufacturing. However, the limited build volume of a commercially available 3D printer is one inherent constraint, which holds its acceptability by the manufacturing business leaders. This paper aims to address the issue by presenting a novel classification of the possible ways by which 3D-printed parts can be joined or welded to achieve a bigger-sized component. Design/methodology/approach A two-step literature review is performed. The first section deals with the past and present research studies related to adhesive bonding, mechanical interlocking, fastening and big area additive manufacturing of 3D printed thermoplastics. In the second section, the literature searches were focused on retrieving details related to the welding of 3D printed parts, specifically related to friction stir welding, friction (spin) welding, microwave and ultrasonic welding. Findings The key findings of this review study comprise the present up-to-date research developments, pros, cons, critical challenges and the future research directions related to each of the joining/welding techniques. After reading this study, a better understanding of how and which joining/welding technique to be applied to obtain a bigger volume 3D printed component will be acquired. Practical implications The study provides a realistic approach for the joining of 3D printed parts made by the fused deposition modeling (FDM) technique. Originality/value This is the first literature review related to joining or welding of FDM-3D printed parts helping the 3D printing fraternity and researchers, thus increasing the acceptability of low-cost FDM printers by the manufacturing business leaders.

Stress and the Mobility Training Process: A Literature Review

1988 ◽  
Vol 82 (4) ◽  
pp. 143-147 ◽  
Author(s):  
B.A. O'Donnell
Keyword(s):  
Literature Review ◽  
Stress Reduction ◽  
Visually Impaired ◽  
Future Research ◽  
Research Projects ◽  
Independent Mobility ◽  
Training Process ◽  
Reduction Techniques ◽  
Visually Impaired Students ◽  
Mobility Training

Stress is considered to be a major problem in the mobility training process. The effects of stress, potential stress reduction techniques, factors which impact independent mobility, and suggested areas of future research are discussed in this literature review. Practitioners should consider implementing some of these strategies to alleviate the anxiety of their visually impaired students and clients during mobility training. Hopefully, a greater number of professionals will become more involved in conducting formalized research projects in this area.

scholarly journals Multimedia Mathematical Communication in a Diverse Group of Students

2019 ◽  
Vol 2 ◽  
pp. 92-103
Author(s):  
Jolanta Brzostek-Pawłowska
Keyword(s):  
Visually Impaired ◽  
Group Leader ◽  
Research Projects ◽  
Mathematical Communication ◽  
Specific Nature ◽  
Learning Mathematics ◽  
Mathematical Problems ◽  
Visually Impaired Students ◽  
The Individual ◽  
Visually Impaired Persons

The article tackles the problem of improving mathematical communication in a group of students with different visual impairment levels, under the guidance of a group leader or a teacher. Visually impaired persons face a problem while learning mathematics. The said problem results from the specific nature in which mathematical content (formulas, function graphs, geometrical figures and projections of solids) is recorded and presented. The effectiveness of learning mathematics is boosted when students work in a group moderated by a leader. This requires them to share documents, with the leader being able to keep track of the individual work of each participant, and with the group discussing specific solutions. In order for a visually impaired student to be able to participate in and contribute to the work of the group, either remotely or locally, all participants must use universal IT tools that support visually impaired students without complicating the work of others. This paper presents interactive multimedia solutions developed under two research projects carried out by the author. The said solutions support communication in mathematics. Results of qualitative surveys on new solutions are presented, confirming their usefulness and the measurable impact they exert on the efficiency of the group’s work concerning mathematical problems.

A physical investigation of dimensional and mechanical characteristics of 3D printed nut and bolt for industrial applications

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ramesh Chand ◽  
Vishal S. Sharma ◽  
Rajeev Trehan ◽  
Munish Kumar Gupta
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
3D Printing ◽  
Surface Properties ◽  
3D Printer ◽  
Content Type ◽  
Safety Issues ◽  
Machine Failure ◽  
Sharp Edges ◽  
3D Printed

Purpose A nut bolt joint is a primary device that connects mechanical components. The vibrations cause bolted joints to self-loosen. Created by motors and engines, leading to machine failure, and there may be severe safety issues. All the safety issues and self-loosen are directly and indirectly the functions of the accuracy and precision of the fabricated nut and bolt. Recent advancements in three-dimensional (3D) printing technologies now allow for the production of intricate components. These may be used technologies such as 3D printed bolts to create fasteners. This paper aims to investigate dimensional precision, surface properties, mechanical properties and scanning electron microscope (SEM) of the component fabricated using a multi-jet 3D printer. Design/methodology/approach Multi-jet-based 3D printed nut-bolt is evaluated in this paper. More specifically, liquid polymer-based nut-bolt is fabricated in sections 1, 2 and 3 of the base plate. Five nuts and bolts are fabricated in these three sections. Findings Dimensional inquiry (bolt dimension, general dimensions’ density and surface roughness) and mechanical testing (shear strength of nut and bolt) were carried out throughout the study. According to the ISO 2768 requirements for the General Tolerances Grade, the nut and bolt’s dimensional examination (variation in bolt dimension, general dimensions) is within the tolerance grades. As a result, the multi-jet 3D printing (MJP)-based 3D printer described above may be used for commercial production. In terms of mechanical qualities, when the component placement moves from Sections 1 to 3, the density of the manufactured part decreases by 0.292% (percent) and the shear strength of the nut and bolt decreases by 30%. According to the SEM examination, the density of the River markings, sharp edges, holes and sharp edges increased from Sections 1 to 3, which supports the findings mentioned above. Originality/value Hence, this work enlightens the aspects causing time lag during the 3D printing in MJP. It causes variation in the dimensional deviation, surface properties and mechanical properties of the fabricated part, which needs to be explored.

Controlled Release of Bi-Layered Malvidin Tablets Using 3D Printing Techniques

2021 ◽  
pp. 70-78
Author(s):  
Tejinder Kaur ◽  
Suruchi Singh
Keyword(s):  
Controlled Release ◽  
3D Printing ◽  
Fruits And Vegetables ◽  
Physical And Mechanical Properties ◽  
3D Printer ◽  
Anti Cancer ◽  
Printing Cost ◽  
3D Printed ◽  
Cost Efficient ◽  
3D Printing Technique

Malvidin belongs to the class of anthocyanidin, a pigment compound present in fruits and vegetables like the colored berries, flowers, and vegetables which have pigments on it and it is available commercially as malvidin chloride. Malvidin is known to possess many medicinal characteristics like anti-microbial, anti-diabetic, anti-inflammatory, anti-obesity, and anti-cancer. In this research paper, a 3D printing technique is used which evolves a 3D printer based on desktop that extrudes tablets comprising the active drug which here is malvidin our main ingredient and the other excipients which are used as binders and disintegrants. Methods which are adapted here for the formulation of 3D printed tablet make the tablets appropriate for immediate and sustained release with its definite physical and mechanical properties like hardness, friability, and weight. Tablets that are extruded by the 3D printer are controlled release bi-layer tablets. Due to involvement of 3D printer, printing cost for the bi-layered tablets found very low that makes our method as cost efficient.

History of Additive Manufacturing

2017 ◽  
pp. 1-24 ◽  
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Large Scale ◽  
Selective Laser Sintering ◽  
3D Printer ◽  
3D Objects ◽  
History Of ◽  
Pros And Cons ◽  
3D Printed ◽  
The Common

History of additive manufacturing started in the 1980s in Japan. Stereolithography was invented first in 1983. After that tens of other techniques were invented under the common name 3D printing. When stereolithography was invented rapid prototyping did not exists. Tree years later new technique was invented: selective laser sintering (SLS). First commercial SLS was in 1990. At the end of 20t century, first bio-printer was developed. Using bio materials, first kidney was 3D printed. Ten years later, first 3D Printer in the kit was launched to the market. Today we have large scale printers that printed large 3D objects such are cars. 3D printing will be used for printing everything everywhere. List of pros and cons questions rising every day.

Development and Standardization of an Alienation Scale for Visually Impaired Students

2017 ◽  
Vol 111 (5) ◽  
pp. 427-439 ◽  
Author(s):  
Poonam Punia ◽  
Sandeep Berwal
Keyword(s):  
Visually Impaired ◽  
Low Vision ◽  
Item Analysis ◽  
Visual Impairments ◽  
Reliability And Validity ◽  
Future Research ◽  
Rehabilitation Professionals ◽  
Cultural Estrangement ◽  
Visually Impaired Students ◽  
Context Specific

Introduction The present study was undertaken to develop a valid and reliable scale for measuring a feeling of alienation in students with visual impairments (that is, those who are blind or have low vision). Methods In this study, a pool of 60 items was generated to develop an Alienation Scale for Visually Impaired Students (AL-VI) based on a review of the literature and discussions with colleagues and experts in the field. The items were organized into six dimensions of alienation, namely powerlessness, meaninglessness, normlessness, social isolation, self-estrangement, and cultural estrangement, and were rated on the five-point Likert scale. The standardization of the scale was completed with 118 students with visual impairments in the age group of 10 to 25 years, selected randomly from specialized and inclusive schools in the state of Haryana, India. Results The item analysis was done by calculating t- and r-values; seven items were deleted, and a final 45 items were retained. The calculated value of Cronbach's alpha and split-half correlation came out to be 0.87 and 0.86, respectively. The construct validity was determined by computing the coefficient of correlation between scores of this scale and the scores obtained by using the Student Alienation scale (SAS) of R. R. Sharma (Sharma, 2012). The percentile norm for the scale was determined after verifying normality of the scores by using a Q-Q plot. Discussion The findings of the present study suggest that the AL-VI may serve as a useful tool in future research to assess alienation in persons with visual impairments in India. The findings further demonstrate that the AL-VI produced scores that are reliable and valid. The AL-VI can be used outside India after determining its reliability and validity in context-specific conditions. Implications for practitioners The AL-VI scale is applicable to students with visual impairments, teachers of students with visual impairments, principals, social workers, psychologists, and rehabilitation professionals. Practitioners could use this tool for assessing and understanding the level of alienation among students with visual impairments, thereby helping them in planning and executing strategies for remediating alienation.

scholarly journals Clinical Applications of Patient-Specific 3D Printed Models in Cardiovascular Disease: Current Status and Future Directions

Biomolecules ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1577
Author(s):  
Zhonghua Sun
Keyword(s):  
Cardiovascular Disease ◽  
3D Printing ◽  
Current Status ◽  
Patient Specific ◽  
Future Research ◽  
Junior Doctors ◽  
Imaging Data ◽  
Training Tool ◽  
Complex Anatomy ◽  
3D Printed

Three-dimensional (3D) printing has been increasingly used in medicine with applications in many different fields ranging from orthopaedics and tumours to cardiovascular disease. Realistic 3D models can be printed with different materials to replicate anatomical structures and pathologies with high accuracy. 3D printed models generated from medical imaging data acquired with computed tomography, magnetic resonance imaging or ultrasound augment the understanding of complex anatomy and pathology, assist preoperative planning and simulate surgical or interventional procedures to achieve precision medicine for improvement of treatment outcomes, train young or junior doctors to gain their confidence in patient management and provide medical education to medical students or healthcare professionals as an effective training tool. This article provides an overview of patient-specific 3D printed models with a focus on the applications in cardiovascular disease including: 3D printed models in congenital heart disease, coronary artery disease, pulmonary embolism, aortic aneurysm and aortic dissection, and aortic valvular disease. Clinical value of the patient-specific 3D printed models in these areas is presented based on the current literature, while limitations and future research in 3D printing including bioprinting of cardiovascular disease are highlighted.

Introduction of 3D Printing Technology in the Classroom for Visually Impaired Students

2016 ◽  
Vol 110 (2) ◽  
pp. 115-121 ◽  
Author(s):  
Jo Wonjin ◽  
Hee I Jang ◽  
Rachel Ananda Harianto ◽  
Ji Hyun So ◽  
Hyebin Lee ◽  
...  
Keyword(s):  
3D Printing ◽  
Visually Impaired ◽  
Technology In The Classroom ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Visually Impaired Students

scholarly journals Three-dimensional Printing Versus Conventional Machining in the Creation of a Meatal Urethral Dilator: a Cost and Mechanical Strength Analysis

2020 ◽  
Author(s):  
Michael Yue-Cheng Chen ◽  
Jacob Skewes ◽  
Ryan Daley ◽  
Maria Ann Woodruff ◽  
Nicholas John Rukin
Keyword(s):  
3D Printing ◽  
Three Dimensional ◽  
Patient Specific ◽  
Strength Analysis ◽  
Fused Deposition Modelling ◽  
3D Printer ◽  
Current Time ◽  
Fused Deposition ◽  
3D Printed ◽  
Conventional Machining

Abstract BackgroundThree-dimensional (3D) printing is a promising technology but the limitations are often poorly understood. We compare different 3D printingmethods with conventional machining techniques in manufacturing meatal urethral dilators which were recently removed from the Australian market. MethodsA prototype dilator was 3D printed vertically orientated on a low cost fused deposition modelling (FDM) 3D printer in polylactic acid (PLA) and acrylonitrile butadiene styrene (ABS). It was also 3D printed horizontally orientated in ABS on a high-end FDM 3D printer with soluble support material, as well as on a SLS 3D printer in medical nylon. The dilator was also machined in stainless steel using a lathe. All dilators were tested mechanically in a custom rig by hanging calibrated weights from the handle until the dilator snapped. ResultsThe horizontally printed ABS dilator experienced failure at a greater load than the vertically printed PLA and ABS dilators respectively (503g vs 283g vs 163g, p < 0.001). The SLS nylon dilator and machined steel dilator did not fail. The steel dilator is most expensive with a quantity of five at 98 USD each, but this decreases to 30 USD each for a quantity of 1000. In contrast, the cost for the SLS dilator is 33 USD each for five and 27 USD each for 1000. ConclusionsAt the current time 3D printing is not a replacement for conventional manufacturing. 3D printing is best used for patient-specific parts, prototyping or manufacturing complex parts that have additional functionality that cannot otherwise beachieved.

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