This allowed them to ascertain how best to reassemble his shattered left cheek and eye socket and restore the symmetry of his face.
The team had to re-fracture Mr Power's cheekbones before remodelling his face and then used custom printed models, guides, plates and implants to repair the injuries. A medical-grade titanium implant, printed in Belgium, was then used to hold the bones in their new shape.
"It is totally life-changing," Mr Power said. "I could see the difference straight away the day I woke up from the surgery."
Maxillofacial surgeon Adrian Sugar says the 3D printing removed the element of guesswork that is usually involved in reconstructive work.
"I think it's incomparable - the results are in a different league from anything we've done before," he said. "It allows us to be much more precise."
Mr Power's operation is featured in an exhibition called 3D: printing the future at London's Science Museum.
Having used a hat and glasses to mask his injuries before the operation, Mr Power has said the surgery has left him feeling more confident.
"I'm hoping I won't have to disguise myself - I won't have to hide away," he said.
"I'll be able to do day-to-day things, go and see people, walk in the street, even go to any public areas."
- INDEPENDENT