Titanium

Although there are now bikes with 3D-printed titanium frames, they're out of most cyclists' price range. That said, if a current Kickstarter campaign is successful, you may soon be able to buy a set of thin, light pedals made in the same fashion.

It can be tricky enough getting titanium implants to bond with the surrounding bone, but when the patient has osteoporosis, things get even harder. An experimental coating may help, though, by first boosting and then blocking inflammation.

Engineers at Cornell University have developed a new technique for 3D printing metallic objects – and it involves blasting titanium particles at supersonic speeds. The resulting metals are very porous, making them useful for biomedical implants.

If there are two things that gear nerds like, it's multi-tools and carabiners. We've thus seen a number of devices that combine the two, with the latest being the titanium-bodied Mul.Ti.Biner 2.0.

Titanium-obsessed Septum Studio has launched a few pieces of ultralight gear in the past, and now it's back with a new take on the spork. An entire place setting in a single lightweight utensil, the EATI makes it easy to dine on the move.

The 3D-printing of titanium-alloy objects does open up some intriguing possibilities. That said, the finished items aren't always as strong as they could be. New research suggests that adding copper to those alloys could make a big difference.

Refrigeration and air conditioning could use a boost in efficiency. On that road, researchers have now developed an unusual new technique that could lead to "twist fridges", which cool by unraveling fibers that are tensely twisted.

Rock guitarists sometimes have a strange relationship with their instruments, with many sacrificing them to their art. When Sandvik decided to make an unbreakable all-metal guitar, naturally the company asked fellow Swede Yngwie Malmsteen to try and destroy it.

​In a demonstration of what could be commercially possible within the near future, HRE Wheels recently teamed up with GE Additive’s AddWorks team to create the first-ever titanium wheel to be 3D-printed via Electron Beam Melting. The process is said to be more efficient than traditional machining.

Lockheed Martin is no stranger to 3D printing components, but now the company has created its largest piece to date – titanium domes to cap off satellite fuel tanks. Using additive manufacturing can help satellites be assembled faster and with less wasted materials.

​Australian company Titomic has unveiled what it claims is the world's largest metal 3D printer. Utilizing a patented process co-developed with Australian federal scientific research agency the CSIRO, the 3D metal printer boasts a build area 9 m long, 3 m wide and 1.5 m high (29.5 x 9.8 x 4.9 ft).

​Titanium is very biocompatible, which is why it's so often used for medical implants. That said, chemical compounds in the metal sometimes do result in implants being rejected by the body. Scientists at RMIT University are attempting to address the problem, by coating such implants with diamonds.