Yes, 4mm walls are definitely overkill. And printing solid walls will also cost you a fortune. Design a space frame chassis (not sure that's the correct terminology, I'm sure some proper engineering types can correct me). As it's charged by the volume of material you use, the less waste material, the more money you can save. Think of how a bike frame is designed, lots of beams to make a solid structure, not just one big lump of material. I'd say the most I've ever spent on a 3d printed chassis is 40 euros, and the least is under 10 euros.
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