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I am trying to use the difference mode to make a hole.

enter image description here

But when I select Difference and the object it does this?

enter image description here

I removed all the doubles and recalculated normals on both objects but it still does this?

Blend file

Muly
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    It is hard to see what are your objects before the boolean operation. Could you share the initial file here (before the boolean applied) ? http://blend-exchange.giantcowfilms.com/ – lemon Jun 24 '16 at 17:19
  • Sorry, heres the file: – Muly Jun 24 '16 at 17:23

2 Answers2

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It was a scale / normals problem : your objects scales were negative.

I applied rotations and scales ctrlA, then adjusted the normals (in edit mode ctrlN for both objects).

Then your model is ready for the boolean (difference) :

lemon
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There is also a couple add-ons to fall back on if regular Boolean does not work. These are 'Booltool' and 'Booltron'

  • Please add some steps as to how these add-ons help vs a normal boolean and what features of these add-ons need to be operated. – Ray Mairlot Jun 24 '16 at 21:47