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Andy · 27th July 2015, 07:43 AM

All surfaces should face outwards - that way, the boolean operations know what's 'inside' or 'outside'.

You should probably check the result more carefully. Switch it to single sided and you may see holes where the cylinder surfaces that were wrong touched the main object.

You might want to check the objects for leaky surfaces before you do the boolean too. Any holes, even if they are hard to see, can cause problems with the boolean ops.

27th July 2015, 07:43 AM	#10
Andy Administrator Professional user Join Date: Jun 2003 Posts: 4,565	Re: Holes in Objects All surfaces should face outwards - that way, the boolean operations know what's 'inside' or 'outside'. You should probably check the result more carefully. Switch it to single sided and you may see holes where the cylinder surfaces that were wrong touched the main object. You might want to check the objects for leaky surfaces before you do the boolean too. Any holes, even if they are hard to see, can cause problems with the boolean ops.