One piece 3D printed airplanes! Add a small M3 bolt for nose weight - but make it safer with some tape or some Blue Tack stuck to the front as the bolt can break things if it hits. While the print is still warm bend the wings into the dihedral shape - bend them slightly up at the root where they meet the plane's body against the heated bed. If you use PLA know they will be fragile and will break after a few hard impacts. Best used on a grass field free of obstacles. Nylon would be a better choice.

Original model: https://www.thingiverse.com/thing:4868033