Selection of functional materials for surface-coating of structural synthetic fibres and development of a 3D-printing system for their manufacture

A novel additive manufacturing algorithm was developed to increase the consistency of three-dimensional (3D) printed curvilinear or conformal patterns on freeform surfaces. The algorithm dynamically and locally compensates the nozzle location with respect to the pattern geometry, motion direction, and topology of the substrate to minimize lagging or leading during conformal printing. The printing algorithm was implemented in an existing 3D printing system that consists of an extrusion-based dispensing module and an XYZ-stage. A dispensing head is fixed on a Z-axis and moves vertically, while the substrate is installed on an XY-stage and moves in the x–y plane. The printing algorithm approximates the printed pattern using nonuniform rational B-spline (NURBS) curves translated directly from a 3D model. Results showed that the proposed printing algorithm increases the consistency in the width of the printed patterns. It is envisioned that the proposed algorithm can facilitate nonplanar 3D printing using common and commercially available Cartesian-type 3D printing systems.

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Data Clustering and Slice Generation of Point Cloud Data for Direct 3D Printing System

10.14733/cadconfp.2019.106-110 ◽

2019 ◽

Author(s):

Tianyun Yuan ◽

Xiaobo Peng ◽

Dongdong Zhang ◽

Lin Li

Keyword(s):

3D Printing ◽

Data Clustering ◽

Point Cloud ◽

Point Cloud Data ◽

Cloud Data ◽

Printing System

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3D Printing of Thermo-Sensitive Drugs

Pharmaceutics ◽

10.3390/pharmaceutics13091524 ◽

2021 ◽

Vol 13 (9) ◽

pp. 1524

Author(s):

Sadikalmahdi Abdella ◽

Souha H. Youssef ◽

Franklin Afinjuomo ◽

Yunmei Song ◽

Paris Fouladian ◽

...

Keyword(s):

3D Printing ◽

Three Dimensional ◽

Fused Deposition Modelling ◽

Future Directions ◽

Digital Light Processing ◽

Fused Deposition ◽

Printing Technique ◽

3D Printed ◽

Semi Solid ◽

Selection Of

Three-dimensional (3D) printing is among the rapidly evolving technologies with applications in many sectors. The pharmaceutical industry is no exception, and the approval of the first 3D-printed tablet (Spiratam®) marked a revolution in the field. Several studies reported the fabrication of different dosage forms using a range of 3D printing techniques. Thermosensitive drugs compose a considerable segment of available medications in the market requiring strict temperature control during processing to ensure their efficacy and safety. Heating involved in some of the 3D printing technologies raises concerns regarding the feasibility of the techniques for printing thermolabile drugs. Studies reported that semi-solid extrusion (SSE) is the commonly used printing technique to fabricate thermosensitive drugs. Digital light processing (DLP), binder jetting (BJ), and stereolithography (SLA) can also be used for the fabrication of thermosensitive drugs as they do not involve heating elements. Nonetheless, degradation of some drugs by light source used in the techniques was reported. Interestingly, fused deposition modelling (FDM) coupled with filling techniques offered protection against thermal degradation. Concepts such as selection of low melting point polymers, adjustment of printing parameters, and coupling of more than one printing technique were exploited in printing thermosensitive drugs. This systematic review presents challenges, 3DP procedures, and future directions of 3D printing of thermo-sensitive formulations.

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3D printing of functional polymers for miniature machines

Multifunctional Materials ◽

10.1088/2399-7532/ac4836 ◽

2022 ◽

Author(s):

Neng Xia ◽

Dongdong Jin ◽

Veronica Iacovacci ◽

Li Zhang

Keyword(s):

3D Printing ◽

Control Strategies ◽

Functional Materials ◽

Functional Polymers ◽

Small Scale ◽

Self Healing ◽

Power Sources ◽

Miniature Robots ◽

Composite Polymers ◽

Printing Techniques

Abstract Miniature robots and actuators with micrometer or millimeter scale size can be driven by diverse power sources, e.g., chemical fuels, light, magnetic, and acoustic fields. These machines have the potential to access complex narrow spaces, execute medical tasks, perform environmental monitoring, and manipulate micro-objects. Recent advancements in 3D printing techniques have demonstrated great benefits in manufacturing small-scale structures such as customized design with programmable physical properties. Combining 3D printing methods, functional polymers, and active control strategies enables these miniature machines with diverse functionalities to broaden their potentials in medical applications. Herein, this review provides an overview of 3D printing techniques applicable for the fabrication of small-scale machines and printable functional materials, including shape-morphing materials, biomaterials, composite polymers, and self-healing polymers. Functions and applications of tiny robots and actuators fabricated by 3D printing and future perspectives toward small-scale intelligent machines are discussed.

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Laboratory 3D printing system

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i2.23.11886 ◽

2018 ◽

Vol 7 (2.23) ◽

pp. 68 ◽

Cited By ~ 1

Author(s):

Anton V. Mironov ◽

Aleksandra O. Mariyanac ◽

Olga A. Mironova ◽

Vladimir K. Popov

Keyword(s):

3D Printing ◽

Fused Deposition Modeling ◽

Uv Laser ◽

Universal System ◽

Fused Deposition ◽

On Demand ◽

Drop On Demand ◽

Different Types ◽

Deposition Modeling ◽

Printing System

Present work describes the results of the development of the universal system, which capable to utilize varies 3D printing methodologies. The main goal of the study is to provide cheap, versatile and easy expandable equipment for multiple purpose research in the field of material science. 3D printing system was experimentally validated for fused deposition modeling, hydrogel, liquid dispensing and drop-on-demand printing, as well as 3D photopolymerisation by UV laser and/or LED light using different types of materials.

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3D Printing in Heterogeneous Catalysis—The State of the Art

Materials ◽

10.3390/ma13204534 ◽

2020 ◽

Vol 13 (20) ◽

pp. 4534 ◽

Cited By ~ 1

Author(s):

Elżbieta Bogdan ◽

Piotr Michorczyk

Keyword(s):

Additive Manufacturing ◽

Heterogeneous Catalysis ◽

3D Printing ◽

Chemical Synthesis ◽

State Of The Art ◽

Three Dimensional ◽

Production Method ◽

The State ◽

Monolithic Catalysts ◽

Selection Of

This paper describes the process of additive manufacturing and a selection of three-dimensional (3D) printing methods which have applications in chemical synthesis, specifically for the production of monolithic catalysts. A review was conducted on reference literature for 3D printing applications in the field of catalysis. It was proven that 3D printing is a promising production method for catalysts.

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Rapid and Inexpensive Fabrication of Multi-Depth Microfluidic Device using High-Resolution LCD Stereolithographic 3D Printing

Journal of Manufacturing and Materials Processing ◽

10.3390/jmmp3010026 ◽

2019 ◽

Vol 3 (1) ◽

pp. 26 ◽

Cited By ~ 6

Author(s):

Mohamed Mohamed ◽

Hitendra Kumar ◽

Zongjie Wang ◽

Nicholas Martin ◽

Barry Mills ◽

...

Keyword(s):

High Resolution ◽

3D Printing ◽

Soft Lithography ◽

Liquid Crystal Display ◽

Three Dimensional ◽

Microfluidic Devices ◽

Single Step ◽

Droplet Generator ◽

Rapid Fabrication ◽

Printing System

With the dramatic increment of complexity, more microfluidic devices require 3D structures, such as multi-depth and -layer channels. The traditional multi-step photolithography is time-consuming and labor-intensive and also requires precise alignment during the fabrication of microfluidic devices. Here, we present an inexpensive, single-step, and rapid fabrication method for multi-depth microfluidic devices using a high-resolution liquid crystal display (LCD) stereolithographic (SLA) three-dimensional (3D) printing system. With the pixel size down to 47.25 μm, the feature resolutions in the horizontal and vertical directions are 150 μm and 50 μm, respectively. The multi-depth molds were successfully printed at the same time and the multi-depth features were transferred properly to the polydimethylsiloxane (PDMS) having multi-depth channels via soft lithography. A flow-focusing droplet generator with a multi-depth channel was fabricated using the presented 3D printing method. Experimental results show that the multi-depth channel could manipulate the morphology and size of droplets, which is desired for many engineering applications. Taken together, LCD SLA 3D printing is an excellent alternative method to the multi-step photolithography for the fabrication of multi-depth microfluidic devices. Taking the advantages of its controllability, cost-effectiveness, and acceptable resolution, LCD SLA 3D printing can have a great potential to fabricate 3D microfluidic devices.

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