Diff boolean

 From: Michael Gibson 11 Jun 2007  (5 of 5)
 660.5 In reply to 660.4 Hi Dragon, the problem in this case is your cutting object has gotten a bit messy, it is made up of a lot of different pieces that are kind of overlapping over top of each other. This is the problem piece: If you select it an run Edit/Separate on it, you can then drag the faces that make it up, and you can see that they're kind of bigger pieces that overlap over top of each other: That kind of overlapped surfaces inside one single object is not good, it will confuse the booleans. To fix it, go in there and select the 5 bottom edges of the current shape: And then do Edit/Copy. Now delete the whole object and then do Edit/Paste - this is the basic way to extract an edge from a solid as an independent curve. That should leave you with these curves: Now run Construct / Extrude to punch those curves up into a new solid. This new solid will have a streamlined simple structure where each side is just one single surface - it will now work as a cutting object for your boolean. Hopefully that should let some smoke out of your firepit! :) - Michael