We report a case of a 47-year-old male with left-sided periorbital deformity, ptosis, and ophthalmoplegia following craniotomy for traumatic brain injury. CT revealed complete loss of the left supraorbital portion of the frontal bone. A customized 3D-printed titanium mesh was used for anatomical reconstruction via a bicoronal flap, re-entering through the existing craniotomy scar. Frontal sinus duct patency was confirmed intraoperatively with methylene blue, and bilateral small suction drains were placed. The patient showed excellent functional and aesthetic recovery. This case highlights the benefits of 3D planning and multidisciplinary management in post-cranial reconstructive surgery.