Selective Laser Sintering

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  1. Modified laser cutting system becomes an open-source laser sintering platform

    Bioengineers at Rice University (Houston, TX) modified a commercial CO 2 laser cutting system to create OpenSLS, an open-source, selective laser sintering (SLS) platform that can print intricate 3D objects from powdered plastics and biomaterials. The system costs at least 40 times less than its commercial counterparts and allows researchers to work with their own specialized powdered materials. OpenSLS, which was built using low-cost, open-source microcontrollers, cost less than $10,000 to build—commercial SLS platforms typically start around $400,000 and can cost up to $1 million. Study co-author Jordan Miller, an assistant professor of bioengineering at Rice University who specializes in using 3D printing for tissue engineering and regenerative medicine, explains that commercial SLS machines generally do not allow users to fabricate objects with their own powdered materials, which is something that is particularly important for researchers who want to experiment with biomaterials for regenerative medicine and other biomedical applications. "Designing our own laser-sintering machine means there's no company-mandated limit to the types of biomaterials we can experiment with for regenerative medicine research," says study co-author Ian Kinstlinger, a graduate student in Miller's group who designed several of the hardware and software modifications for OpenSLS. The team showed that the machine could print a series of intricate objects from both nylon powder—a commonly used material for high-resolution 3D sintering—and from polycaprolactone (PCL), a nontoxic polymer that is commonly used to make templates for studies on engineered bone. Unlike most commercial SLS platforms, Rice University's OpenSLS allows researchers to work with their own powdered materials, including specialized biomaterials like polycaprolactone (PCL), a common nontoxic polymer that was used to print these tissue-engineering scaffolds. Researcher Ian Kinstlinger developed a method for smoothing the surfaces (left) of newly printed scaffolds (right) using vaporized solvent. ( Credit: Jeff Fitlow/Rice University ) OpenSLS works differently than most traditional extrusion-based 3D printers, which create objects by squeezing melted plastic through a needle as they trace out 2D patterns. Three-dimensional objects are then built up from successive 2D layers. In contrast, the SLS laser shines down onto a flat bed of plastic powder. Wherever the laser touches powder, it melts or sinters the powder at the laser's focal point to form a small volume of solid material. By tracing the laser in two dimensions, the printer can fabricate a single layer of the final part. Miller, an active participant in the open-source maker movement, first identified commercial CO 2 laser cutters as prime candidates for a low-cost, versatile selective sintering machine in early 2013. "The cutter's laser is already in the correct wavelength range—around 10µm—and the machines come with hardware to control laser power and the x -axis and y -axis with high precision," he says. In summer 2013, Miller hosted a four-week crash course in hardware prototyping called the Advanced Manufacturing Research Institute (AMRI), and AMRI participant Andreas Bastian, an artist and engineer, took on the challenge of creating the open-source SLS printer. He designed an integrated, high-precision z -axis and powder-handling system and fitted it with open-source, 3D printer electronics. Kinstlinger addressed each possibility with PCL by developing an efficient way to smooth the rough surfaces of PCL objects that came out of the printer. He found that exposing the parts to solvent vapor for short time periods (around 5 min.) provided a very smooth surface because of surface-tension effects. In tests using human bone marrow stromal cells—the type of adult stem cells that can differentiate to form bone, skin, blood vessels, and other tissues—Kinstlinger found that the vapor-smoothed PCL structures worked well as templates for engineered tissues that have some of the same properties as natural bone. For more information, please visit https://youtu.be/BCbDFt0MbTY .

    Online Articles

    Online Articles

    Fri, 26 Feb 2016

  2. Mercedes-Benz produces truck spare parts using 3D printing

    Mercedes-Benz Trucks is standardizing use of a 3D printing method for producing plastic spare parts.

    Online Articles

    Online Articles

    Fri, 22 Jul 2016

  3. Laser additive manufacturing helps produce unmanned aerial system

    Reinforced composite materials have taken laser additive manufacturing technology to new heights to produce parts for a leisure drone.

    Magazine Articles

    Magazine Articles

    Thu, 14 Jul 2016

  4. 3D printers: Judgment day

    Interest in additive manufacturing (3D printing) went viral this year, and with that interest came more confusion on exactly what this technology can do and where it stands in its adoption cycle.

    Magazine Articles

    Magazine Articles

    Fri, 1 Mar 2013

  1. Laser additive manufacturing helps produce unmanned aerial system

    Online Articles

    Online Articles

    Wed, 25 May 2016

  2. Additive manufacturing revolutionizes in space and on the racetrack

    CRP USA is strategically located in the heart of NASCAR country in North Carolina, and specializes in additive manufacturing and 3D printing applications.

    Magazine Articles

    Magazine Articles

    Wed, 16 Mar 2016

  3. Proto Labs to acquire Alphaform AG

    Additive manufacturing services provider Proto Labs has reached agreement to acquire select assets and operations of Alphaform AG.

    Online Articles

    Online Articles

    Fri, 25 Sep 2015

  4. 3D printing center to open in Singapore starting in 1Q 2015

    Ultra Clean Holdings, Inc. will offer 3D printing services through the acquisition of privately held Prototype Asia LLC and the opening of its Additive Manufacturing Center in Singapore. Services will be available beginning in the first quarter of 2015.

    Online Articles

    Online Articles

    Tue, 25 Nov 2014

  5. Solid Concepts acquires one DMLS and four FDM machines

    These machines will help prepare for complex applications requiring durability, heat, chemical resistance, and design freedom.

    Online Articles

    Online Articles

    Thu, 20 Jun 2013

  6. Drill bit innovator exploring 3D laser manufacturing systems

    BlueFire Equipment Corp. has formed an additive manufacturing initiative for producing its polycrystalline diamond cutter drill bits.

    Online Articles

    Online Articles

    Mon, 30 Sep 2013

  7. Laser sintering blazes new trails in tool manufacturing

    A short video from German tool company Toolcraft shows its selective laser melting process in action.

    Online Articles

    Online Articles

    Wed, 7 Aug 2013

  8. Additive Manufacturing Users Group doles out awards for technical skill

    The Additive Manufacturing Users Group (AMUG) has named the recipients of its awards for technical skill, which were presented at the 26th annual users group conference in Tucson, AZ.

    Online Articles

    Online Articles

    Tue, 22 Apr 2014

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