Kamden Hall, left, Jack Sylvester, right, and Acazia Smiley, back, wait Tuesday for Serenity Fitzgerald, second from left, to finish with the glue gun used to make covered wagons at Oak Hill Middle School in Sabattus. Their fifth grade class was learning about westward expansion, the 19th-century movement of settlers into the American West. They filled wagons with characters and supplies, and a wrote a journal as if they were a pioneer on the Oregon Trail, based on what they are learning. Russ Dillingham/Sun Journal

Fifth-grader William Bumpus designs a covered wagon Tuesday on a computer before sending it to a 3D printer at Oak Hill Middle School in Sabattus. The class was learning about westward expansion, the 19th-century movement of settlers into the American West. They filled wagons with characters and supplies, and a wrote a journal as if they were a pioneer on the Oregon Trail, based on what they are learning. Most students built wagons with shoe boxes, popsicle sticks and hot glue. Russ Dillingham/Sun Journal