海角大神

Derby the dog was born with small forearms and no front paws. Now, the 1-year-old dog runs several miles each day, thanks to his 3-D-printed prosthetic legs.

Tara Anderson, who first took in Derby from foster care, initially tried other methods of helping the dog to walk, including attaching him to a two-wheeled cart. But she found Derby couldn鈥檛 play well with other dogs with the bulky equipment.

Fortunately for Derby, Ms. Anderson works for a South Carolina company that specializes in 3-D printers. And in September, Derby received his first set of prosthetic legs.

Prosthetic legs, even for dogs, are nothing new. But the speed and low cost with which 3-D printing enables their production is a notable development in the field of prosthetics 鈥� and moreover, developers can keep tweaking the computer designed model until it works perfectly.

That鈥檚 what happened for Derby.

The first set of legs wasn't quite right 鈥� the dog had trouble balancing, according to the dog鈥檚 Facebook page.

But future rounds came a lot closer. A subsequent set was fashioned into ridged, half-moon聽ovals that fastened over his front legs. They allowed Derby to run.聽From there, the company made minor adjustments to the design, adding treads and raising their height.

Now, Derby bounds through the neighborhood. 3-D Systems, the company that fashioned Derby鈥檚 legs, released a full-length video showing the dog鈥檚 progress on Monday.聽

Derrick Campana, an orthotist who specializes in animal care, worked with product managers at 3-D Systems to create designs.

鈥淗aving these images on file in a computer and being able to print them is a lot quicker than having to hand-sculpt every single mold and rebuild these braces 5-10 times,鈥� he says in the video.

Before she went through the process with 聽Derby, 3-D printing was totally new to Melissa Hannon, a co-founder of Peace and Paws, which first rescued Derby.

鈥淲e had no idea how it would happen or how it would come about,鈥� she says.聽But when she saw Derby running, she was 鈥渢hrilled.鈥�

鈥淔rom the very beginning, we said we want this dog to be able to run, whether it was on wheels or prosthetics,鈥� she says.聽She hopes Derby鈥檚 story shows viewers that dogs with disabilities have options.

In Derby鈥檚 case, she says, the 3-D printed legs allowed him to run 鈥渨ith ease.鈥澛犫�淲ords can鈥檛 even describe," she says, "how incredible that was to see.鈥澛�

3-D printing technology has helped many different species walk and move. Earlier this year, a Chihuahua named TurboRoo received a 3-D printed cart, fashioned in bright orange and green, and a duck named Dudley began walking on a 3-D printed flipper, TechCrunch reported.聽

And, of course, humans have benefitted from the technology, too. Last year, Leon McCarthy, then 12, started using a prosthetic hand, fashioned from a 3-D printer. His dad crafted the hand for him after connecting with a Washington man who had printed hands before.聽