Ok, what I'm trying to do here is use the sketch on the top plane to remove material from the concave face outwards, leaving a 1mm rim around the window to it can be mounted in a case.
I've tried using a cut-extrude reversing the offset and choosing the side to cut. Unfortunately, the only option is "through all", which is not what I want to achieve. I need make a 1mm deep cut outwards...
If the piece part was flat, clearly this would be a simple planar face cut extrude...because the part is bent like a banana, it's giving me grief!
Either I need more sleep or more caffeine...my brain isn't working today and can't see the wood for the trees to solve this issue :/
Message was edited by: Jason Aspinall