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I will bare it mind next time and not use that layer. I have just done what you suggested and printed to pdf fine now. Thanks

Well spotted. With the Environment layer switched on I can repeat your problem. I suggest you dont use the enivironment layer in this way and create a new layer for the large blocks you want, but although it works for what you want now you may limit your options later.

To resolve your problem select the environment layer and select each block on that layer and in the Selection tab select Send to back. The blocks will then appear behind your 2D walls instead of in front.

I've just noticed in your preview you look to have the environment switched off. Can you not print with this on, as I have details on that level.

yes I am printingt to a3 landscape, I'll email you a screen shot.

Can you upload or email a screenshot showing your print view similar to above. You didnt confirm that you are printing to A3 landscape which is the paper size you will need to accommodate your drawing size.

I'm using Pdf creator which you recommended, I've just checked DPI and its already set at 150 as you suggested. The detail also disappears in my preview window.