3D Printing Information Briefs, February 13, 2021: Jilin College, College of Alberta & Royal Army Academy, voxeljet, Google ATAP – 3DPrint.com

We have more research and 3D printing products that we can share with you in today’s 3D Printing News Briefs. So read on for more information!

3D bioprinting tissue & organoids for the regeneration of the breast structure

According to a study by researchers from Jilin University Second Hospital in China, the most commonly diagnosed cancer in women with breast cancer, which has a relatively high mortality rate, and non-metastatic cases, it is often necessary to remove part or all of it Chest. Obviously, this isn’t always a good option from a mental health perspective, which is why breast reconstruction is highly recommended. There are several methods nowadays including autologous fat grafting, artificial implants, and autologous tissue valves, but there can be some pretty serious adverse effects, which is why some researchers are studying breast structure regeneration with tissue engineering using stem cells and studying various biomaterials. This team was looking for an alternative solution: 3D bioprinting.

The executive summary states: “This overview is intended to illustrate the available manufacturing methods for 3D bioprinting of breast tissue, various biomaterials suitable for breast tissue regeneration, and previous approaches and designs for breast tissue regeneration. The review shows the potential for breast fat tissue and mammary gland regeneration using 3D bioprinting. To solve the remaining puzzles, we have summarized and suggested possible plans that could ultimately facilitate 3D bioprinting technology as a promising approach to breast reconstruction for clinical applications. “

You can read the full research paper here.

3D printed test projectiles to study IED fragmentation

Above: 3D renderings of ballistic designs to be printed for the Royal Military Academy in Belgium; below: 3D printed ballistic samples of various geometries. The samples consist of quartz sand bound together with a polymer binder. The designs were chosen to observe the changes in mass and stability

One of the greatest hidden threats members of the military face today is buried charges such as improvised explosive devices (IEDs). These are particularly dangerous because soil debris near the explosion area is shot towards service members as what is known as secondary fragmentation, which consists of gravel, sand and stones when detonated. Soldiers wear protective gear, but in a test scenario it can be difficult to gather accurate data to improve the equipment because most standard tests use an all-metal fragment simulating a projectile rather than a mixture of sand, gravel and rocks. A group of researchers from the University of Alberta in Canada and the Royal Military Academy in Belgium published an article on their work developing a “methodological and reproducible method” for testing damage from fragmentation of debris. The bottom line is that they used an ExOne 3D printer to make test projectiles out of quartz sand.

The summary says: “We are presenting the novel process of 3D printing ballistic projectiles from quartz sand, followed by launching with an air cannon. It describes the technology’s achievements, challenges, and proposed implementations. The 3D-printed sand projectiles reached speeds in excess of 170 m / s, which resulted in measurable damage to individual Kevlar plates. Other flight parameters such as yaw and turn were recorded, which led to observations on the design and shape of the projectiles. It was found that one design performed better in terms of speed, rotation, and impact. The technology has the potential to disrupt the protective equipment sector by providing a controlled means of assessing natural fragmentation damage. “

You can read the full research paper here.

voxeljet case study on a 3D printed coral running shoe

According to a case study by voxeljet, sales of sneakers are expected to rise to 91 billion euros by 2025. However, the shoe industry continues to face problems such as sustainability, customization and automation. Shoe designer Shun Pin Pek, who studied product design at Nanyang Technology University and focused specifically on shoe design at the Pensole Design Academy in the United States, bought his first 3D printer in 2017 and saw the many possibilities that technology has for making shoes offers. including geometric freedom and CAD data. He was inspired by the environment and came up with the idea for his “Coral Runner” shoe concept, as coral and 3D printing follow a similar growth strategy. He opted for voxeljet’s High Speed ​​Sintering (HSS) 3D printing process to create an initial polymer prototype of the shoe, which consists of a single element without adhesives, fasteners or seams. The Coral Runner prototype has a simple design reinforced by the coral-like tubular structures and was 3D printed in elastic TPU material from Covestro.

“The big advantage of 3D printing is both on-demand production and the one-to-one transfer of the digital model into a real object,” said Shun Ping Pek. “While the Coral Runner could theoretically also be manufactured using conventional production techniques such as injection molding, this route would have been very difficult due to the uniform design. HSS technology offers the ideal solution. “

Google ATAP Designing 3D Printable Technical Experiences

Jacquard tag included in the
Sleeves of a denim jacket

Google’s Advanced Technology and Projects (ATAP) research and development laboratory group works to solve problems that often use 3D printing such as Stratasys PolyJet technology to solve them. The Group’s Jacquard from Google is a portable platform that integrates the digital into everyday life without disturbing the user. It includes an app as well as a small 3D printed physical label that can be fitted to soft goods such as a backpack or jacket to give the wearer an interactive digital experience without having to hold a device. Instead, you can answer a call, take a photo or pause your music with a simple tap or swipe on the jacket sleeve. Thanks to the versatile PolyJet multi-material 3D printing and KeyShot 10 rendering software, the team was able to merge a product pipeline for soft and hard goods, using flexible, Pantone-validated color materials to simulate surface textures.

“Printers are really catching up with how designers think about design and materials. The future is coming much faster than expected, and at Google ATAP we are building the capabilities to predict what’s possible, ”said Bryan Allen, technical program manager and head of ATAP Lab.