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What happens when you try to fill a Klein bottle?

The Klein Bottle is a 4D mathematical oddity. We test a 3D model to see how its non-orientable surface behaves when filled ...
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Why I’m buying a filament 3D printer instead of resin

Filament 3D printing, also known as FDM (fused deposition modeling) or material extrusion, involves melting filament which is ...