Most new startups in 3D printing are rather boring. There’s lots of whizzbang but very little fundamental innovation. Most of them are looking to score not looking to improve 3D printing as a whole. Aerosint may very well be one of the few startups that could bring true innovation to 3D printing. The startup is looking to change how powder bed systems recoat themselves, how they deal with supports and in the process open up a whole host of new materials and applications while also reducing the cost of parts. We interviewed Kevin Eckes of repair crack in fiberglass spa to find out more about this potentially very exciting startup.
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Aerosint is a company founded in 2016 on the idea that selective powder deposition will make additive manufacturing more capable, scalable, and less expensive. We have developed a mechanical system that replaces the normal powder recoater in SLS/SLM systems so that multiple powders can be deposited in a single layer with spatial selectivity.
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We believe our technology will allow for the scaled production of advanced parts that are topology-, material-, and cost-optimized. Most powder bed fusion AM techniques currently are focused primarily on geometric capability, far less on part cost, and almost not at all on efficiency gains through the use of multiple materials. In short, we want to help additive manufacturing live up to its hype and be able to build the best parts possible at the lowest cost.
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The system we have developed deposits small ‘voxels’ of powder in a line-by-line fashion from rotating drums that pass over a build platform in an SLS or SLM machine. Unlike the single-material recoating process used in SLS/SLM/MJF/binder-jetting processes, in using our system one has full three-dimensional control over powder material placement, which is required for building multi-material parts.
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It’s the most efficient geometry for the application. With a rotating drum the only limits of the X and Z dimensions are the size of the machine enclosing the Aerosint recoater system. The length of the rotating drum (i.e. axial dimension) limits the Y-dimension of the build.
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We mean, quite literally, more than one material. Our system can pattern two or more powdered materials side by side. Of course, sintering them together is an altogether different matter, and we cannot circumvent fundamental physical limitations. Therefore, two polymers or two metals with similar thermal processing temperatures can realistically be incorporated into a single part using the Aerosint powder deposition system to structure the constituent powders prior to sintering.
There’s also a possibility of making what we call “pseudo multi-material” parts. These would be parts in which the bulk of the part is a base polymer, and certain regions include composite materials composed of the same base polymer with an additive, such as glass fiber, carbon fiber, or even nanoparticles to locally enhance the part’s mechanical, electrical, or magnetic properties.
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Recently we’ve demonstrated the co-deposition and sintering of flexible TPU with rigid polystyrene (left) as well as multiple colors of TPU (right).
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You can think of the powder images we create as physical versions of binary (i.e. black and white) images. So, while we can’t pattern truly continuous gradients we can do dithered ‘digital’ gradients to form interfaces between two materials (see above, left). In our system, theoretically, you can pattern as many materials as you have rotating drums. In practice, there is, of course, a limit based on the machine size but 2, 3, or 4 drums per machine could be realized.
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Surfaces can be optimized in terms of material properties and material savings. One useful application is to be able to create parts that have a hard surface material to resist wear and abrasion combined with a tough inner material to resist brittle fracture (left). This strategy is even more attractive if the cost of the surface material is high relative to the bulk material. In another example, a copper part with high thermal conductivity can be made stronger and more resistant to stress with a steel surface (right).
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The most mature multi-material 3D printing processes are dependent on the curing of multiple expensive polymer resins, sometimes containing nanoparticles (as is the case for conductive resins). These resins are often quite expensive, and they tend to age and become brittle after printing. Because of these and other disadvantages, this resin jetting and curing process is better suited for prototyping rather than production-scale AM.
Powder bed AM processes have proven to be the fastest, most cost-effective, and scalable of all the various AM methods. We wanted to develop a process that builds on existing powder bed technology to make it able to process multiple materials. Our powder deposition system is also material-agnostic — we can handle polymer, ceramic, and many metal powders.
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SLS of polymers is rather wasteful because unfused powder that has undergone an hours-long heated build process changes chemically in ways that prohibit its direct re-use in a subsequent build. Some amount can be reused when mixed with virgin powder, but there is almost always an amount which is thrown away.
The problem is worse for high sintering temperature materials, such as PEEK and other high-performance thermoplastics. It happens that these materials are also quite expensive to begin with, so any powder savings translates to significant cost savings. Our system allows for the deposition of expensive build powders only where needed, because a cheap, non-fusing support powder (such as ceramic) can be co-deposited in each layer.
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With conservative assumptions for build density and powder refresh rate based on data provided to us by a major service bureau, we estimate that the value of material wasted in a fullgta iv pc keygen download build of PEEK powder printed in an EOS P800 system is about how to crack final fantasy vii remake 32,000 USD. After only 38 full builds, the cost of powder waste cod ghosts 32 bit crack password would exceed the cost of the EOS P800 machine itself!
For PA12 and similar conservative assumptions, for a full build in an EOS P760 system the powder waste cost amounts to nearly dxftool professional crack 3,000 USD.
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With an Aerosint recoater depositing both non-fusing ceramic support powder and polymer build powder, we believe the powder waste rate could be reduced to less than 1% of the overall amount of powder input in the process. For PEEK this represents less than 500 USD/build, or a dope coke crack smack remix lyrics savings of over 31,500 USD savings per build. In the case of PA12 the waste would be reduced to 74 USD/build, corresponding to a savings of lws 11 keygen 2,926 USD/build. Considering the hundreds of builds a major service bureau would do per year per machine, the cumulative savings can easily amount to millions of dollars per year.
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For the multi-material case, we have active projects to combine flexible and rigid polymers like TPU and PA12, multi-colored polymers, and steel and copper. For the powder savings case we are focused almost exclusively on PEEK, and we’re developing a powder deposition system that will withstand the extreme operating conditions needed for PEEK SLS.
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For circuits, indeed an approach cleverer than simply melting copper and polymer side by side is needed since bulk copper has a much higher melting temperature than any thermoplastic. We know of some interesting work being done to develop sinterable polymer composite materials that can be made selectively conductive in a post-processing step. As long as the matrix polymer of the conductive precursor material has a similar melting temperature as the surrounding bulk material, it should be possible to print conductive paths and insulating material at once using our system.
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Our first efforts are focused on steel and copper. With the same prototype system other metal-metal combinations should eventually be possible to validate.
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Our technology is maturing quickly but many aspects still need to be validated. In particular we need to combine our powder deposition expertise with the materials processing expertise of others to push our technology closer to the market.
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Our technology should enable multi-material AM, but we have limited in-house experience and resources to explore the space of material combinations that might be possible. We’re interested in working with research institutions and especially R&D departments of companies that have identified a need for multi-material additive manufacturing for improving their products and market position.
We’ll have a booth next week at Formnext in Frankfurt among the other startup challenge winners, and we welcome anyone to stop by to discuss applications and collaboration possibilities.