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Micromachines
Special Issues
3D Printing Technology and Its Applications
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3D Printing Technology and Its Applications

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D：Materials and Processing".

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 3346

Special Issue Editors

Dr. Sangmin Lee

E-Mail Website
Guest Editor
Division of Mechanical, Automotive and Robot Component Engineering, Dong-Eui University, Busan 47340, Republic of Korea
Interests: micro-electro-mechanical system (MEMS) design and fabrication; 2D/3D printing system; flexible/wearable sensor microfluidic technology
Dr. Jongkyeong Lim

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Gachon University, Seongnam 13120, Republic of Korea
Interests: 3D micro/nanostructure; 3D printing; MEMS/NEMS; surface modification
Dr. Hojin Kim

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Dongseo University, Busan 47011, Republic of Korea
Interests: 3D printing; microfluidics; lab-on-a-chip; rapid diagnosis
Dr. Sanghyun Lee

E-Mail Website
Guest Editor
Division of Mechanical, Automotive and Robot Component Engineering, Dong-Eui University, Busan 47340, Republic of Korea
Interests: microfluidics; lab-on-a-chip; printing systems; semiconductor package assembly

Special Issue Information

Dear Colleagues,

Three-dimensional printing technology, also known as additive manufacturing, permits the construction of various 3D structures by adding material in a “layer-by-layer” manner. Several 3D printing techniques, including polyjet, stereolithography, fused deposition modeling, and selective laser sintering, have been developed to produce acceptable structures for applications in a variety of industries, including electronics, structural materials, and tissue engineering.

With the development of various printable materials such as thermoplastic polymers, photocurable polymers, metals, and composite materials including functional materials such as micro- or nanoparticles, the application range of 3D printing technology is further expanding.

This Special Issue focuses on new approaches in the area of 3D printing technology or their application technologies. Submissions should span all aspects of the development and application of these 3D printing technologies.

Dr. Sangmin Lee
Dr. Jongkyeong Lim
Dr. Hojin Kim
Dr. Sanghyun Lee
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • 3D printing
  • adaptive manufacturing
  • bioprinting
  • photocurable polymer fabrication
  • 3D-printed electronics
  • flexible or wearable device fabrication
  • dynamics of droplet deposition processes

Published Papers (3 papers)

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Research

15 pages, 22815 KiB  
Article
Lightweight and High-Stiffness Metal Optical Systems Based on Additive Manufacturing
by Qiang Fu, Lei Yan, Shuanglong Tan, Yang Liu and Lingjie Wang
Micromachines 2024, 15(1), 128; https://doi.org/10.3390/mi15010128 - 12 Jan 2024
Viewed by 906
Abstract
To build a long-wave infrared catadioptric optical system for deep space low-temperature target detection with a lightweight and wide field of view, this work conducted a study that encompasses a local cooling optical system, topology optimization-based metal mirror design, and additive manufacturing. First, [...] Read more.
To build a long-wave infrared catadioptric optical system for deep space low-temperature target detection with a lightweight and wide field of view, this work conducted a study that encompasses a local cooling optical system, topology optimization-based metal mirror design, and additive manufacturing. First, a compact catadioptric optical system with local cooling was designed. This system features a 55 mm aperture, a 110 mm focal length, and a 4-degree by 4-degree field of view. Secondly, we applied the principles of topology optimization to design the primary mirror assembly, the secondary mirror assembly, and the connecting baffle. The third and fourth modes achieved a resonance frequency of 1213.7 Hz. Then, we manufactured the mirror assemblies using additive manufacturing and single-point diamond turning, followed by the centering assembly method to complete the optical assembly. Lastly, we conducted performance testing on the system, with the test results revealing that the modulation transfer function (MTF) curves of the optical system reached the diffraction limit across the entire field of view. Remarkably, the system’s weight was reduced to a mere 96.04 g. The use of additive manufacturing proves to be an effective means of enhancing optical system performance. Full article
(This article belongs to the Special Issue 3D Printing Technology and Its Applications)
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14 pages, 57718 KiB  
Article
Advanced Design and Fabrication of Dual-Material Honeycombs for Improved Stiffness and Resilience
by Jiajing Dong, Songtao Ying, Zhuohao Qiu, Xixi Bao, Chengyi Chu, Hao Chen, Jianjun Guo and Aihua Sun
Micromachines 2023, 14(11), 2120; https://doi.org/10.3390/mi14112120 - 18 Nov 2023
Cited by 1 | Viewed by 1020
Abstract
Auxetic re-entrant honeycomb (AREH) structures, consisting of a single soft or tough material, have long faced the challenge of balancing stiffness and rebound resilience. To achieve this balance, dual-material printing technology is employed to enhance shock absorption by combining layers of soft and [...] Read more.
Auxetic re-entrant honeycomb (AREH) structures, consisting of a single soft or tough material, have long faced the challenge of balancing stiffness and rebound resilience. To achieve this balance, dual-material printing technology is employed to enhance shock absorption by combining layers of soft and tough materials. Additionally, a novel structure called the curved re-entrant honeycomb (CREH) structure has been introduced to improve stiffness. The selected materials for processing the composite structures of AREH and CREH are the rigid thermoplastic polymer polylactic acid (PLA) and the soft rubber material thermoplastic polyurethane (TPU), created utilizing fused deposition modeling (FDM) 3D printing technology. The influence of the material system and structure type on stress distribution and mechanical response was subsequently investigated. The results revealed that the dual-material printed structures demonstrated later entry into the densification phase compared to the single-material printed structures. Moreover, the soft material in the interlayer offered exceptional protection, thereby ensuring the overall integrity of the structure. These findings effectively serve as a reference for the design of dual-material re-entrant honeycombs. Full article
(This article belongs to the Special Issue 3D Printing Technology and Its Applications)
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14 pages, 3514 KiB  
Article
Experimental Validation of a Micro-Extrusion Set-Up with In-Line Rheometry for the Production and Monitoring of Filaments for 3D-Printing
by João Sousa, Paulo F. Teixeira, Loïc Hilliou and José A. Covas
Micromachines 2023, 14(8), 1496; https://doi.org/10.3390/mi14081496 - 26 Jul 2023
Cited by 1 | Viewed by 1027
Abstract
The main objective of this work is to validate an in-line micro-slit rheometer and a micro-extrusion line, both designed for the in-line monitoring and production of filaments for 3D printing using small amounts of material. The micro-filament extrusion line is first presented and [...] Read more.
The main objective of this work is to validate an in-line micro-slit rheometer and a micro-extrusion line, both designed for the in-line monitoring and production of filaments for 3D printing using small amounts of material. The micro-filament extrusion line is first presented and its operational window is assessed. The throughputs ranged between 0.045 kg/h and 0.15 kg/h with a maximum 3% error and with a melt temperature control within 1 °C under the processing conditions tested for an average residence time of about 3 min. The rheological micro slit is then presented and assessed using low-density polyethylene (LDPE) and cyclic olefin copolymer (COC). The excellent matching between the in-line micro-rheological data and the data measured with off-line rotational and capillary rheometers validate the in-line micro-slit rheometer. However, it is shown that the COC does not follow the Cox–Merz rule. The COC filaments produced with the micro-extrusion line were successfully used in the 3D printing of specimens for tensile testing. The quality of both filaments (less than 6% variation in diameter along the filament’s length) and printed specimens validated the whole micro-set-up, which was eventually used to deliver a rheological mapping of COC printability. Full article
(This article belongs to the Special Issue 3D Printing Technology and Its Applications)
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