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I don't undestand when why i print my gear (with central hole) the hole (only on the top) is fill and not print.

There's problem in my blend project ? Is non manifold ?

I hope someone can help me !

Sorry for my english...

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    $\begingroup$ you need to recalculate the normals (in Edit mode, select all and ctrl N), maybe it causes problems? I don't know enough about 3D print... $\endgroup$ – moonboots Apr 4 '19 at 21:25
  • $\begingroup$ You are great ! works !!!! $\endgroup$ – Borja Apr 5 '19 at 0:21
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Some normals are flipped, so go in Edit mode, select all and recalculate the normals with ctrlN

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