This cuts down hugely on start-up delays, which tend to be common with the Connex500 because its software is not very scalable, Vidimce told us. This software requires you to give a 3D mesh for every part of an object that specifies the boundaries. "This works if you're doing something simple, like three parts and three different materials, but not if you've got a complex structure where materials are mixed and keep changing at a fine level: it takes too long and you run out of memory quickly."
Not every engineer wants to specify exactly what material properties should go where. Some just want to say "make an object that functions like this." That's where Spec2Fab comes in, a functional approach to specification. Using a "reducer tree," it reduces the object into smaller components, and its "tuner network" decides what the material composition of each should be. "With Spec2Fab, you don't have to care about materials," Piotr Didyk, post-doctoral associate, told Design News, in the interview. "You specify your design goal and the software optimizes it for material placement to achieve that goal."
Although the two techniques weren't designed to be layered on top of each other, they could be used together, said Vidimce. "If you have specific constraints for some parts of an object, you can specify the materials for it using OpenFab. But in another part of the object that needs functional specification, Spec2Fab could be used."
The team will open source the API portion of OpenFab, but will release only binaries for the back-end that does all the work, said Vidimce. Spec2Fab will be open-sourced for academic use only to begin with, Pitchaya Sitthi-Amorn, post-doctoral associate, told us.
The team presented their work in two papers at SIGGRAPH 2013: "OpenFab: A Programmable Pipeline for Multi-Material Fabrication," by Kiril Vidimce, Szu-Po Wang, Jonathan Ragan-Kelley, and Wojciech Matusik and "Spec2Fab: A Reducer-Tuner Model for Translating Specifications to 3D Prints," by Desai Chen, David I. W. Levin, Piotr Didyk, Pitchaya Sitthi-Amorn, and Wojciech Matusik.
The Strati EV car printed at the IMTS show is made of SABIC's LNP STAT KON AE003. SABIC tells Design News why this carbon fiber-reinforced compound was chosen by Local Motors and Oak Ridge National Laboratories.
NASA's MAVEN spacecraft has entered Mars' atmosphere, carrying instruments to help Earthlings figure out what happened to it. Launched last November, the spacecraft arrived at the red planet right on time after a journey of 442 million miles.
Airbus Defence and Space has 3D printed titanium brackets for communications satellites. The redesigned, one-piece 3D-printed brackets have better thermal resistance than conventionally manufactured parts, can be produced faster, cost 20% less, and save about 1 kg of weight per satellite.
At IMTS last week, Stratasys introduced two new multi-materials PolyJet 3D printers, plus a new UV-resistant material for its FDM production 3D printers. They can be used in making jigs and fixtures, as well as prototypes and small runs of production parts.
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