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Prosthetic Dental Treatments: Traditional Stone Casts vs. 3D Printed Casts – 3DPrint.com | The Voice of 3D Printing / Additive Manufacturing

prosthetic dental treatments: traditional stone casts vs. 3d printed casts – 3dprint.com | the voice of 3d printing / additive manufacturing

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Egyptian researchers Passent Aly and Cherif Mohsen compare the benefits of 3D printing with conventional techniques for the production of prosthetic dental casts, releasing the findings of their study in ‘Comparison of the Accuracy of Three-Dimensional Printed Casts, Digital, and Conventional Casts: An In Vitro Study.’
In relation to oral and jaw restoration, prosthetics can be critical to the health of many patients. In this study, Aly and Mohsen match conventional stone casts with prosthetic casts 3D printed using stereolithography (SLA), as well as with “digital casts,” that is, 3D scans of existing stone casts. While digital technology is becoming increasingly popular for items like casts—replacing traditional methods with 3D printing for prototyping and creating functional parts—the authors point out that, for clinical practice, such processes must be heavily evaluated first.
In testing the effectiveness of digital casts in this study, Aly and Mohsen used a light desktop scanner to fabricate prototypes. For reference in comparison during experimentation, the researchers used a set of maxillary and mandibular ivory teeth. Five stone casts were made from polyvinylsiloxane impressions.
Maxillary and mandibular conventional stone casts.
“The typodont casts (reference casts) were scanned using intraoral dental scanner (Trios 3Shape) in the …

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Testing the Strength of Hollow, 3D-Printed PLA Spheres – 3DPrint.com | The Voice of 3D Printing / Additive Manufacturing

testing the strength of hollow, 3d-printed pla spheres – 3dprint.com | the voice of 3d printing / additive manufacturing

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Researchers from Romania have studied the mechanical properties of parts fabricated from polylactic acid, releasing the details of their recent study in ‘Mechanical Behavior of 3D Printed PLA Hollow Spherical Parts Under Axial Compression.’
Often used in the construction of bearings and spherical joints, spherical parts usually assist as intermediates in the movement of other components; for example, they may allow rotation to occur or for one part to slide smoothly toward another. Filled spheres tend to be more rigid, while cave spheres are elastic.
Users may employ both metallic and non-metallic materials, and the authors note that ‘plastics present a particular interest.’ In this study, the researchers focused on cave spheres produced from plastic while under compression.
Expected elastic behavior of a spherical hollow part under the action of an axial compression force
While there are numerous methods for fabrication of parts, additive manufacturing is of interest to the authors in this study—especially in terms of the following results:

Surface roughness
Surface layer properties
Material homogeneity

“In the case of the technological process of manufacturing the spherical parts, some process input factors can influence the surface roughness of the final product,” explain the researchers. “If 3D printing is …

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First construction 3D printing deal between two large firms Sika and Pikus

first construction 3d printing deal between two large firms sika and pikus

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US-based Pikus Concrete is teaming up with Sika to commercialize 3D concrete printing technology in the construction industry and to capture its vast potential. Pikus’ first 3D concrete printer with Sika technology has commenced operation in Lehi, Utah. The company is working on implementing the technology in the first construction projects. This marks the first time a construction 3D printing deal involves two well-established commercial construction companies. Previous projects have generally involved at least one startup or government investment entity.
Sika’s entire know-how in digitalization and industrialization of concrete construction, built over decades, has been brought together in its 3D printing technology. The expertise ranges from robotics, process control system, and extruding system, to concrete technology and mix design and formulation of 3D mortars to allow for precise control of how the concrete behaves. Sika is the only company capable of supplying all the technologies required for industrial 3D concrete printing from a single source.
Sika’s 3D concrete printing technology allows complex geometries to be realized economically
Increased speed in construction
One key advantage Pikus sees is the increased speed of a project build, as building and dismantling of formwork is no longer necessary. “We will be able …

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Global 3D Printing Medical Device Market Analysis 2020-2027, Featuring Leading Players Prodways Group, Formlabs, Stratasys Ltd., 3D Systems, Inc. and Materialise NV

global 3d printing medical device market analysis 2020-2027, featuring leading players prodways group, formlabs, stratasys ltd., 3d systems, inc. and materialise nv

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DUBLIN, May 29, 2020 /PRNewswire/ — The “Global 3D Printing Medical Device Market Outlook 2027” report has been added to ResearchAndMarkets.com’s offering.
The global 3D printing medical device market is anticipated to grow at a CAGR of around 17%% during the forecast period, i.e. 2019-2026. Factors such as growing advancement in healthcare infrastructure, increasing government expenditure for the development of the healthcare industry along with the rising demand for organ transplant amongst individuals around the globe are anticipated to contribute significantly towards the growth of the global 3D printing medical device market. Additionally, increasing utilization of 3D printing medical devices in the healthcare industry owing to the numerous benefits associated with the utilization of the devices in the industry, coupled with the increasing geriatric population around the world, which demands a greater share of organ implants, are some of the factors anticipated to drive the growth of the global 3D printing medical device market.The global 3D printing medical device market consists of various segments that are segmented by technology, by component, by type and by region. The component segment is sub-divided into equipment, materials and software & services. Out of these, the equipment segment, which had a market value of around USD 340 …

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Using electric pulses to finely post-process metal 3D printed parts – 3D Printing Industry

using electric pulses to finely post-process metal 3d printed parts – 3d printing industry

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Researchers at Saarland University have developed a non-contact method for transforming 3D printed metal parts into high-precision technical components for specialist applications.
The novel technique leverages electrochemical machining (ECM) to post-process additive manufactured metal components into precision-finished parts with complex geometries and dimensional tolerances of a few thousandths of a millimetre. 
Such a method is intended to improve the implementation of 3D printed metal parts in applications that have to meet extremely strict dimensional requirements in industries such as automotive and aerospace. 
“Our technology for post-processing additively manufactured metal parts offers a cost-effective means of producing high-precision functional surfaces for applications where extremely tight tolerances are crucial,” explains Professor Dirk Bähre from Saarland University. 
“It enables large numbers of parts to be post-processed efficiently and economically.”
Professor Dirk Bähre (here with Stefan Wilhelm from his research group) and his research team at Saarland University. Photo via Saarland University/Oliver Dietze.
Meeting the dimensional requirements for specialized applications
Complex technical systems like the engines that power cars, planes or rockets are made from a large number of highly specialized metal components. Often, to ensure that these parts fit together perfectly and are able to weather extreme mechanical stresses, each …

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Sustainable Cabin Built on 3D-Printed Concrete Stilts from Infested Ash Wood – 3DPrint.com | The Voice of 3D Printing / Additive Manufacturing

sustainable cabin built on 3d-printed concrete stilts from infested ash wood – 3dprint.com | the voice of 3d printing / additive manufacturing

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Our house had several ash trees in the front and back yard while I was growing up, and we lost three of them due to various acts of nature. Ash is a very soft wood, which is how we lost one to high winds, and another split at the top because it wasn’t well-supported at the bottom. The third was removed because it had been infected by the invasive Emerald Ash Borer beetle, a nasty little bugger that’s not even native to the US but is here wreaking havoc anyway.
Obviously, ash trees that have been infected and destroyed by the EAB aren’t often used for construction purposes, both because sawmills can’t process the wood, and due to their odd, irregular shapes. These trees are then usually burned or left to decompose, neither of which is a great option.
“Unfortunately, both scenarios release carbon dioxide into the atmosphere, and so the advantage to using compromised ash for construction is that is that it both binds the carbon to the earth and offsets the harvesting of more commonly used wood species,” said Sasa Zivkovic, the Co-Principal of New York-based architecture studio HANNAH.
The Ithaca studio—founded in 2014 …

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2 Under-the-Radar 3D Printing Stocks Continue to Crush the Market @themotleyfool #stocks $DDD $SSYS $PRLB $MTLS

2 under-the-radar 3d printing stocks continue to crush the market @themotleyfool #stocks $ddd $ssys $prlb $mtls

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Many investors probably consider 3D printing a loser space. This is understandable since the group’s two best-known and longest publicly traded companies, 3D Systems (NYSE:DDD) and Stratasys (NASDAQ:SSYS), seem to have become experts at printing red ink. Their struggles growing revenue and turning a profit have resulted in their stocks performing poorly since peaking more than six years ago.
But writing off the entire group is a mistake. The global market for 3D printing products and services is expected to reach $40 billion in 2024, for a compound annual growth rate of more than 26%, according to Statista. That’s just a little behind IDC’s estimate that the artificial intelligence market will grow at an average annual rate of about 28% from 2019 through 2023. (You can read my picks for the top AI stocks here.) 
Moreover, there are two lesser-known 3D printing stocks that have not only crushed the market so far in 2020, but have also outperformed over the mid-term and since their initial public offerings (IPOs): Proto Labs (NYSE:PRLB) and Materialise (NASDAQ:MTLS), which had their IPOs in 2012 and 2014, respectively. 

A 3D printer at work. Image source: Getty Images.

3D printing stocks: Key stats  
Before we get into our two winning 3D …

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Nexa3D releases xCE-Black material for ultra-fast SLA 3D printing

nexa3d releases xce-black material for ultra-fast sla 3d printing

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Days after announcing a new distribution partnership with southern European 3DZ Group, 3D printing company Nexa3D has released a new material for its ultra-fast stereolithography technology. The resin, xCE-Black, is a high-performance, single-cure polymer with excellent isotropic properties as well as long-term environmental stability.
Thanks to this combination of properties, xCE-Black is well suited for the production of automotive, electronic and industrial end-use parts, as well as injection molding tools. The single-cure material is also notable for its high flexural strength, comparable to those of dual-cure cyanate ester resins.
The new resin has undergone extensive testing for a range of end-use applications and has performed well on many fronts. Its excellent thermal and environmental stability are ideal for automotive and electronics applications, among others, while its strength isotropic properties are conducive to the production of injection molding tools for a wide range of thermoplastic polymers, including PP, PE, HDPE and PETG. In tests, 3D printed molds made from xCE-Black were used hundreds of times at temperatures between 230°C and 280°C without any visible mold temperature degradation or adhesion. The material also did not require the use of any mold release agents.
Belt pulleys 3D printed using xCE-Black material

In …

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Slovak researchers develop new “extremely strong” hybrid PETG composites – 3D Printing Industry

slovak researchers develop new “extremely strong” hybrid petg composites – 3d printing industry

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Researchers from the Slovak Academy of Sciences and the Slovak University of Technology have developed a set of new, low-cost hybrid materials for FFF 3D printing. By reinforcing virgin and recycled PETG filament with expanded graphite, carbon fiber, and combinations of both, the team was able to enhance the mechanical and thermal properties of the neat PETG matrices.
Samples 3D printed with the hybrid filaments. Photos via Slovak Academy of Sciences.
Modified 3D printing filaments
Fillers are often added to thermoplastic filaments to improve strength, thermal properties, conductivity, and even appearance. A large part of material science is simply experimenting with additives, testing the composite material, and repeating until the desired properties are attained. PETG, in particular, is known for its impact resistance, flexibility, and excellent chemical resistance.
Hybrid PETG composites
With the goal of creating a lower-cost PETG hybrid material without sacrificing any of its original properties, the researchers first obtained samples of virgin PETG, recycled PETG, expanded graphite, and carbon fiber. They produced a total of 23 composite material samples, 19 of which were from the virgin PETG and 4 of which were from the recycled PETG. Two samples from each group contained no fillers and served as control samples.
The …

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3D printed robot swabs patients’ throats for Covid-19

3d printed robot swabs patients’ throats for covid-19

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Robotics researchers from the University of Southern Denmark have developed the world’s first fully automatic robot to carry out throat swabs for Covid-19. The 3D printed robot swabs (perhaps even using 3D printed swabs) the patients so that healthcare professionals are not exposed to the risk of infection. The prototype has successfully performed throat swabs on several people and is now set to go into operation by late June.
With a 3D printed, specially designed disposable tool, the robot holds a swab and hits the exact spot in the throat from which the sample is to be collected. Subsequently, the robot puts the swab into a glass and screws the lid on to seal the sample. And the researchers have tested the robot.
Thiusius Rajeeth Savarimuthu is in charge of the team of ten researchers working around the clock in the Industry 4.0 Lab at the University of Southern Denmark to develop the prototype as quickly as possible. “We have successfully demonstrated the world’s first fully automatic throat swab and delivered a “Proof of concept” of the processes in a robotized throat swab,” said Savarimuthu. “There are prospects in developing a throat swab robot so that robots can take …

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