Post-printing characterisation and design for additive manufacturing considerations for conductive tracks 3D-printed by material extrusion

2021 ◽  
Vol 10 (1) ◽  
pp. 36
Author(s):  
Marko Chorbikj ◽  
Marco Cavallaro
Keyword(s):  
Additive Manufacturing ◽  
Design For Additive Manufacturing ◽  
Material Extrusion ◽  
3D Printed

On design for additive manufacturing (DAM) parameter and its effects on biomechanical properties of 3D printed ceramic scaffolds

2020 ◽  
Vol 23 ◽  
pp. 101065
Author(s):  
Ali Entezari ◽  
Nai Chun Liu ◽  
Iman Roohani ◽  
Zhongpu Zhang ◽  
Junning Chen ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Biomechanical Properties ◽  
Design For Additive Manufacturing ◽  
3D Printed

Teaching Creativity As a Method to Overcome Limitations in Design for Additive Manufacturing

2020 ◽  
Author(s):  
Sergei Chekurov
Keyword(s):  
Additive Manufacturing ◽  
Teaching Approach ◽  
Major Influence ◽  
Design For Additive Manufacturing ◽  
Student Assignment ◽  
Entry Level ◽  
Material Extrusion ◽  
Teaching Design ◽  
Manufacturing Machine

Abstract This paper describes the challenges and solutions of modifying a normally contact-reliant Design for Additive Manufacturing teaching approach in view of the COVID-19 outbreak. The approach has been put into practice since 2014 in the form of a student assignment that does not provide a specific functional objective but asks students to invent a unique geometry that demonstrates the capabilities of additive manufacturing and manufacture it with an entry level material extrusion machine. The students are asked to use their imaginations to develop an intricate geometry without first considering technical limitations of additive manufacturing. They are then asked to identify the issues with their designs and solve them, while modifying their original vision as little as possible. The goal of the approach is to teach students to identify the limitations of additive manufacturing and to overcome them with creativity when possible. As physical iterative testing using an additive manufacturing machine is essential to the assignment, the outbreak of COVID-19 had a major influence on it. The paper describes how the assignment was adjusted in the spring of 2020 to meet the challenges of not being able to conduct contact teaching. Although the presented exceptional measures should be avoided as the primary way to educate students, they are shown to facilitate teaching Design for Additive Manufacturing with no access to machines. Notable designs developed by students in 2020 are provided as examples of the generated results.

scholarly journals Mechanical Recyclability of Polypropylene Composites Produced by Material Extrusion-Based Additive Manufacturing

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1318 ◽  
Author(s):  
Martin Spoerk ◽  
Florian Arbeiter ◽  
Ivan Raguž ◽  
Clemens Holzer ◽  
Joamin Gonzalez-Gutierrez
Keyword(s):  
Additive Manufacturing ◽  
Chain Scission ◽  
Fused Filament Fabrication ◽  
Polypropylene Composites ◽  
Material Extrusion ◽  
Wide Range ◽  
Tremendous Amount ◽  
3D Printed ◽  
The Impact

Due to a lack of long-term experience with burgeoning material extrusion-based additive manufacturing technology, also known as fused filament fabrication (FFF), considerable amounts of expensive material will continue to be wasted until a defect-free 3D-printed component can be finalized. In order to lead this advanced manufacturing technique toward cleaner production and to save costs, this study addresses the ability to remanufacture a wide range of commercially available filaments. Most of them either tend to degrade by chain scission or crosslinking. Only polypropylene (PP)-based filaments appear to be particularly thermally stable and therefore suitable for multiple remanufacturing sequences. As the extrusion step exerts the largest influence on the material in terms of temperature and shear load, this study focused on the morphological, rheological, thermal, processing, tensile, and impact properties of a promising PP composite in the course of multiple consecutive extrusions as well as the impact of additional heat stabilizers. Even after 15 consecutive filament extrusions, the stabilized additively manufactured PP composite revealed an unaltered morphology and therefore the same tensile and impact strength as the initial material. As the viscosity of the material of the 15th extrusion was nearly identical to that of the 1st extrusion sequence, the processability both in terms of extrusion and FFF was outstanding, despite the tremendous amount of shear and thermal stress that was undergone. The present work provides key insights into one possible step toward more sustainable production through FFF.

scholarly journals Numerical Simulation of a Core–Shell Polymer Strand in Material Extrusion Additive Manufacturing

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 476
Author(s):  
Hamid Narei ◽  
Maryam Fatehifar ◽  
Ashley Howard Malt ◽  
John Bissell ◽  
Mohammad Souri ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Velocity Ratio ◽  
Diameter Ratio ◽  
Core Material ◽  
Operating Parameters ◽  
Core Shell ◽  
Material Extrusion ◽  
The Core ◽  
3D Printed ◽  
Core Polymer

Material extrusion additive manufacturing (ME-AM) techniques have been recently introduced for core–shell polymer manufacturing. Using ME-AM for core–shell manufacturing offers improved mechanical properties and dimensional accuracy over conventional 3D-printed polymer. Operating parameters play an important role in forming the overall quality of the 3D-printed manufactured products. Here we use numerical simulations within the framework of computation fluid dynamics (CFD) to identify the best combination of operating parameters for the 3D printing of a core–shell polymer strand. The objectives of these CFD simulations are to find strands with an ultimate volume fraction of core polymer. At the same time, complete encapsulations are obtained for the core polymer inside the shell one. In this model, the deposition flow is controlled by three dimensionless parameters: (i) the diameter ratio of core material to the nozzle, d/D; (ii) the normalised gap between the extruder and the build plate, t/D; (iii) the velocity ratio of the moving build plate to the average velocity inside the nozzle, V/U. Numerical results of the deposited strands’ cross-sections demonstrate the effects of controlling parameters on the encapsulation of the core material inside the shell and the shape and size of the strand. Overall we find that the best operating parameters are a diameter ratio of d/D=0.7, a normalised gap of t/D=1, and a velocity ratio of V/U=1.

AM-Serienproduktion für die Automobilindustrie/AM series production for the automotive industry

2020 ◽  
Vol 110 (11-12) ◽  
pp. 752-757
Author(s):  
Lukas Weiser ◽  
Marco Batschkowski ◽  
Niclas Eschner ◽  
Benjamin Häfner ◽  
Ingo Neubauer ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Automotive Industry ◽  
Series Production ◽  
Production Scale ◽  
Additive Fertigung ◽  
Small Series ◽  
Start Up ◽  
3D Printed ◽  
Component Quality

Die additive Fertigung schafft neue Gestaltungsfreiheiten. Im Rahmen des Prototypenbaus und der Kleinserienproduktion kann das Verfahren des selektiven Laserschmelzens genutzt werden. Die Verwendung in der Serienproduktion ist bisher aufgrund unzureichender Bauteilqualität, langen Anlaufzeiten sowie mangelnder Automatisierung nicht im wirtschaftlichen Rahmen möglich. Das Projekt „ReAddi“ möchte eine erste prototypische Serienfertigung entwickeln, mit der additiv gefertigte Bauteile für die Automobilindustrie wirtschaftlich produziert werden können. Additive manufacturing (AM) offers new freedom of design. The selective laser-powderbed fusion (L-PBF) process can be used for prototyping and small series production. So far, it has not been economical to use it on a production scale due to insufficient component quality, long start-up times and a lack of automation. The project ReAddi aims to develop a first prototype series production to cost-effectively manufacture 3D-printed components for the automotive industry.

Fused Filament Fabrication 3D Printed Polylactic Acid Electroosmotic Pumps

Lab on a Chip ◽  
2021 ◽  
Author(s):  
Liang Wu ◽  
Stephen Beirne ◽  
Joan-Marc Cabot Canyelles ◽  
Brett Paull ◽  
Gordon G. Wallace ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Polylactic Acid ◽  
Fused Filament Fabrication ◽  
Flexible Approach ◽  
Electroosmotic Pump ◽  
3D Printed ◽  
Electroosmotic Pumps

Additive manufacturing (3D printing) offers a flexible approach for the production of bespoke microfluidic structures such as the electroosmotic pump. Here a readily accessible fused filament fabrication (FFF) 3D printing...

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