Answer:
its weight
its cost
Step-by-step explanation:
According to “7-Year-Old Girl Gets New Hand from 3-D Printer,” the story is told of a disabled young girl, Faith Lennox who has been given a new lease of hand because of a new hand formed from a 3D printer which enables her to play like other children her age.
The 3D hand is said to be relatively inexpensive and very light as it can be reproduced easily and was made from material used to make drones.
Therefore, the features of Faith’s hand most make it a “breakthrough” invention was its cost and weight.