Hyperbolic paraboloid
thingiverse
This is a hyperbolic paraboloid with incorporated supports. Adjust resolution as shown in the pictures: from 0.05mm to 1mm or whatever works for you. Turn thin walls off and select a middle slicing tolerance. Use a raft with 0mm air gap. Additional supports for the middle may be needed if you want a really smooth bottom side, but it prints just fine without them.
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