How to Boolean-diff just one side of a circle ?

 From:  Michael Gibson
5224.7 In reply to 5224.1 
Hi Guy, yup like described above doing an extrusion yourself that's of the limited depth that you need is the way to go for this right now.

Basically when you do the boolean with a 2D curve, internally in the boolean it automatically makes an extruded cutting shape for you that goes through the whole base object. You can manually do the extrusion if you need something different than that.

In the future I do plan on adding some kind of "limit depth" option for cutting things with curves too though to make that kind of thing a little more convenient.

- Michael