Hi Martin, 
 
> Is there any reason that a zero value entered into the 'Thickness' property couldn't be made to work 
>  - I'm thinking that it might be a way of offsetting an entire surface by the amount entered into 
> the 'Use separate height' property? 
 
If I understand you properly, you can instead use the Construct > Offset command to generate that kind of full surface offset. 
 
 
> It probably isn't important, but this is just to let you know that the conrod.3dm 
> test file I supplied seems to works OK in MoI v2. 
 
Ah, thanks for testing in v2 as well - I have taken some updates to the geometry library in v3 and there seems to be some change that has broken a couple of things that used to work before, I am going to be trying to track that down to fix it. I think it has something to do with calculating intersections involving cylinders. 
 
   - Michael 
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