GOSHEN, Ind. (AP) _ Two northern Indiana high school students used their ingenuity and their school's 3D printer to fix a classmate's problematic walker.
 
       Goshen High School seniors Evan Smith and Nick Truex upgraded the wheeled gait trainer classmate Ivonne Lopez uses nearly every day to walk. Her backpack had been pushing the trainer's seat into her legs when she tried to walk, throwing her off balance.
 
       But the boys used the 3D printer to create a clip that holds a bar between the seat and the trainer's frame, keeping the seat from moving even under the weight of the backpack. Lopez calls the helpful invention “wonderful.”
 
       Smith and Truex designed eight versions of the plastic clip before finding one that worked. Both plan to pursue engineering careers.