As a part of the 3D-printing project, MSF started printing transparent masks for patients with facial burns. Following skin graft surgery, where skin from one area of the body is transplanted to a different one, surgeons suggest applying pressure on the affected surface with a mask. The face mask keeps the skin soft and flat during the scar formation phase of healing, helping the face heal with the least amount of scarring. ( <PERSON>/Al Jazeera)