Hello Michael,

>>>>>>>Hi Steve, yes unfortunately it's a difficult one to fix - in this case the bug is not in the MoI code that I wrote but instead it is in the geometry library.

It will probably be able to get fixed eventually but it can be slow to get progress in some areas like this.<<<<<<<


You said that when I made the bug report, you also dismissed the possibility that the problem was with the sweep rather than the boolean.


I have attached a simple model of the ring, this was constructed in another 3d app. when imported into MOI, the pipes can be booleaned away without a problem (both pipes are 6 dia).
If you import and delete the pipes, then make a sweep with a 6 dia circle in Moi using the construction curves (which where used to construct the pipes in the other 3d app), then try to use those to boolean away, there are then problems.

So I need to ask again, "Is the problem with the boolean, or with the sweep?"