What is Cap open boundaries 3D tool?
(Shortcut Ctrl + O)
This function (also known as Cap holes) will close the open boundaries on your model with a new face. You can easily recognize open boundaries by red lines. These mean your object cannot be 3D printed.
Just click the Cap open boundaries icon in the bottom panel. All the holes in your object will be automatically closed.
Tip: You can close your hole manually too. Use Draw lines tool in Edit mode and Snap to end.
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