Smooth STL but Distorted OBJ?

Hi there, I'm new to the Tinkercad.  I design with it and export as .STL for 3D printing (FDM).  All is well until I have to export as .OBJ for MeshMixer.

Please see the screen shots and you'll see that, while things are smooth in STL, many areas are distorted / broken in OBJ.  It's got the same problem if I import the smooth STL into MeshMixer, same distorted / broken object.

Please help me with this.  Thanks.

Arys Chien


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