this is something I battle a lot. two parts both .75 approx and both set to merge but they still show 1.5 thickness.
http://dl.dropbox.com/u/1939753/3d%20speakers.crv3d

Hi Steve,

You have two component's one with a positive height of 0.75" (Speaker face) and one with a negative height of 0.75". The components don't overlap so the 'Merge' setting makes no difference as they don't merge into each other, therefore both of the heights are based off the modelling plane. Hence the overall height is 1.5" made up of the +0.75" component and -0.75" component.

If you want them all to be positive, set the base height for the 'back of speaker' component to 0.75" and then both components will fit within 0.75" material.

Does this make sense?

Brian

yes that makes sense. though I had to set it to 1" it did not help for some reason the zero got set to the surface and nto the top of the material. I have no changed it in years.

here are pics of the results