Metal 3d printing soon ‘affordable’ thanks to new Selective Inhibition Sintering (SIS) process

From: | 3D printing in metal is, in some ways, the caviar of the additive manufacturing menu. Not only is it capable of achieving extremely high levels of detail, it is also extremely durable, long-lasting and suitable for countless industrial and medical applications. There’s just one little obstacle barring the way for private usage: it’s terribly expensive. Fortunately, researchers from the University of California have developed a new 3D printing technology that could make desktop metal 3D printers a reality in the near future.

Current metal 3D printing technology is confined to industrial level 3D printers, and tend to use one of either three production methods: electron beam, inkjet and the most popular: laser sintering. Selective Laser Sintering technology (or SLS 3D printing) relies on a high powered, very accurate laser to graft metal powders together into solid objects. While very accurate, you definitely pay the price for the results. A typical laboratory model costs anywhere from $100,000 to a million dollars, and is therefore way out of the league of all small businesses and hobbyists.

And that’s why this study is so intriguing. Recently published in the journal 3D printing and Additive Manufacturing, it has been authored by Payman Torabi, Matthew Petros and Behrokh Khoshnevis, all from the University of California.

They have developed a very peculiar application of inkjet technology that is capable of 3D printing metal, called Selective Inhibition Sintering, or SIS. Click here to read the full article.

Affordable Metal 3D Printing – New Selective Inhibition Sintering (SIS) Process May Be Groundbreaking

From: by Brian Krassenstein | Published on November 11, 2014 | Currently, machines capable of printing with various metal alloys run anywhere from $500,000 on up, making them basically untouchable to the general pubic. Those machines which are currently under development usually combine technologies such as welding with Cartesian-based movement systems of a typical FFF/FDM printer to produce objects which are pretty rough, lacking any type of precision.

This may all be about to change thanks to research being conducted on an entirely new method of metal printing called Selective Inhibition Sintering (SIS). Developed by Dr. Behrokh Khoshnevis and his team at the University of Southern California, this new method of printing is basically the inverse of selective laser sintering and other forms of metal printing. Click here to read the full article.

SIS-Metal Paper is Awarded

The following presentation has been recognized as one of twelve Best Papers for the 2014 Solid Freeform Fabrication Symposium – An Additive Manufacturing Conference:

Calibration of a Piezo-Electric Printhead in the Selective Inhibition Sintering (SIS) Process for Fabrication of High Quality Metallic Parts
P. Torabi, M. Petros, B. Khoshnevis, University of Southern California

Researchers Are Making A 3D Printer That Can Build A House In 24 Hours


From: Business Insider | Published on January 9, 2014 | At The University of Southern California, Professor Behrokh Khoshnevis has built a colossal 3D printer that can build a house in 24 hours. Khoshnevis’s robot comes equipped with a nozzle that spews out concrete and can build a home based on a set computer pattern. The technology, known as Contour Crafting, could completely revolutionize the construction industry. Click here to read more.

Homes on Mars? 3D Printing Could Make That Possible, Says NASA

From: AOL Real Estate |
Published on December 31, 2013 |

The process, called “Contour Crafting,” was conceived as a way to quickly construct emergency housing on this planet out of concrete. But NASA sees other applications for Khoshnevis’ homebuilding innovation — for starters, projects such as an airport on the moon. “Behrokh’s work is one of the most creative and far reaching concepts I’ve seen,” said Jason Derleth, the program manager for NASA Innovative Advanced Concepts, in a news release this past summer. “He really has a chance to change the world by robotically printing buildings here, and he may even change the next human world by doing the same on the moon and Mars.”


“We will build small little habitats, then little towns, and eventually cities on Mars,” says space architect John Spencer, “the same way we did in the United States….” Though, realistically, that could take hundreds of years, Spencer adds.

Click here to read the full article.



3D Printing Multi-Material Objects Just Got Faster

From: USC Viterbi News |
Published on November 20, 2013 |

Researchers at the USC Viterbi School of Engineering have developed a faster 3D printing process and are now using it to model and fabricate heterogeneous objects, which comprise multiple materials.

Although 3D printing – or direct digital manufacturing – has the potential to revolutionize various industries by providing faster, cheaper and more accurate manufacturing options, fabrication time and the complexity of multi-material objects have long been a hurdle to its widespread use in the marketplace. With this newly developed 3D printing process, however, USC Viterbi professor Yong Chen and his team have shaved the fabrication time down to minutes, bringing the manufacturing world one step closer to achieving its goal.


“Digital material design and fabrication enables controlled material distributions of multiple base materials in a product component for significantly improved design performance. Such fabrication capability opens up exciting new options that were previously impossible,” said Yong Chen, professor in the Daniel J. Epstein Department of Industrial and Systems Engineering and the study’s lead researcher.

Traditional modeling and prototyping approaches used to take days, but over the past several decades various additive manufacturing (AM) processes have been developed to fabricate both homogeneous and heterogeneous objects more quickly. Currently, AM processes such as multi-jet modeling, which create a solid 3D object from a digital model by laying down successive layers of material, can fabricate a complex object in a matter of hours.

Last year, Chen and another team of USC Viterbi researchers improved an AM-related process called mask-image-projection-based stereolithography (MIP-SL) to drastically speed up the fabrication of homogeneous 3D objects. In the MIP-SL process, a 3D digital model of an object is sliced by a set of horizontal planes and each slice is converted into a two-dimensional mask image. The mask image is then projected onto a photocurable liquid resin surface and light is projected onto the resin to cure it in the shape of the related layer.

Click here to read the full article.

3D Printers That Build Houses: Saving Construction in Financing and Material While Creating Jobs

From: International Business Times |
Published on October 29, 2013 |


At a TED talk in Ojai, Calif., Behrokh Khoshnevis, director of the Manufacturing Engineering Graduate Program at the University of Southern California, said nearly 1 billion people in the world don’t have access to adequate shelter, a situation that breeds poverty, disease, illiteracy, crime and overpopulation. To address this problem, Khoshnevis is developing a process called Contour Crafting to use 3D printing technology to build entire houses.

Khoshnevis said the giant 3D printers his team is developing can build a 2,500-square-foot house in as little as 20 hours. The Contour Crafting 3D printers could even do the electrical work, plumbing, tiling, finishing work and painting.

Khoshnevis estimated that Contour Crafting will save the construction 20 percent to 25 percent in financing and 25 percent to 30 percent in materials. The biggest savings would come in labor, where Contour Crafting would save 45 percent to 55 percent by using 3D printers instead of humans. There would also be fewer CO2 emissions and less energy used.

But wouldn’t replacing manual laborers with 3D printers put thousands or even millions of people out of work? Khoshnevis doesn’t think so, as he compares it to the early 1900s when people feared that agriculture technology would ruin the economy by putting farmers out of work. Less than 1.5 percent of Americans are farmers today, but the world did not come to an end.

Khoshnevis even posits that Countour Crafting will create new jobs, particularly providing women and older workers a chance to work in new areas of construction.

Click here to read the full article.