Duckling, Buttercup was hatched in November but was born with one foot deformed - the left flipper was bent backwards and did not face appropriately.
Due to this, the duckling could not walk properly. The people who take care of butter cup wished to help the duckling get back on proper two feet.
Mike Garey, from the Feathered Angels Waterfowl Sanctuary in Arlington, Tenn., thought of making a twin, as custom made feet are difficult to find.
Mike scanned Buttercup's sister's foot and converted that into a 3-D model. Designed by Mike Garey, the 3-D-printed foot which took 13 hours to print was the only way to get a foot for Buttercup. Mike Garey did just that after taking a bit of help from Nova Copy.
In February, Buttercup's bad leg was removed with surgery. After his stump got fully healed, a plastic foot which is the exact copy of his sister Minnie's foot was fitted over his knee.
A webbed, flexible silicone prosthetic has given the duckling good mobility to be able to walk and swim, just like the other ducks.