Ok, just finished another boolean tune-up for the next beta - Boolean difference now works well when using surfaces instead of only solids.

This combined with auto-extrude means that this is now possible - given this setup:



Doing a boolean difference of the box with curve as a subtraction gives this (pieces moved to illustrate):



Where each piece is a solid. Here's another example - the results are all solids:




So quite a bit of boolean stuff for the next beta coming...

- Michael