The last tire was real fragged.
So along came another one at 230C, with a 1.6mm tread. It still had voids. Some guys leave their filament on an enclosed print bed for 5 hours. Another thing which might improve layer adhesion is breaking up the smooth tread with slight ridges. A smooth tread still has the best traction with TPU.
As rough as printed tires are, it pays to remember what lions did before 3D printing. Those were desperate times.
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