Same problem, same answer...

Visualisation with 10 param gives you problem.
Export with angle at 12 gives problem.

You have to choose a smaller angle and/or divide faces to fix the problem.

With very small objects, I use angle at 3
Divide larger at 1 on all type of faces
and avoid smaller than 0.3

For your object, you can adapt those params with at least a small angle and a divide at 20 or 25

Have fun

F.R.