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.
To give engineers a better idea of the range of resins and polymers available as alternatives to other materials, this Technology Roundup presents several articles on engineering plastics that can do the job.
The first photos made with a 3D-printed telescope are here and they're not as fuzzy as you might expect. A team from the University of Sheffield beat NASA to the goal. The photos of the Moon were made with a reflecting telescope that cost the research team £100 to make (about $161 US).
A tiny humanoid robot has safely piloted a small plane all the way from cold start to takeoff, landing and coming to a full stop on the plane's designated runway. Yes, it happened in a pilot training simulation -- but the research team isn't far away from doing it in the real world.
Some in the US have welcomed 3D printing for boosting local economies and bringing some offshored manufacturing back onshore. Meanwhile, China is wielding its power of numbers, and its very different relationships between government, education, and industry, to kickstart a homegrown industry.
You can find out practically everything you need to know about engineering plastics as alternatives to other materials at the 2014 IAPD Plastics Expo. Admission is free for engineers, designers, specifiers, and OEMs, as well as students and faculty.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.