Are you looking at some sort of multi-rotor or are you wanting to design a fixed wing aircraft?
@rmackay9 always is doing something interesting. Here’s a link to his blog about designing a multi-rotor aircraft.
3D printers are amazing but I’m pretty sure I’m not alone in thinking most aircraft require some sort of additional framework to provide enough strength and rigidity for a durable vehicle. Carbon fiber rods are a popular choice for strengthening all sorts of aerial vehicles.