Hi Burr, yeah basically another difference of Trim is that it dices up the surface and then lets you manually pick which pieces you want to remove or keep.

You can pick just one single cut piece to remove, which lets you do something like remove only one area where a projected circle cuts your solid to make a hole there.

Also with Trim you can cut everything up and leave all the pieces behind by pushing "Done" or doing a right-click instead of picking any pieces to remove.


Booleans are different - they are focused on automatically deciding which pieces to throw away by where they are located in the different volumes. Like a Union throws away the pieces internal to both pieces, Difference throws away the part that is only inside the subtraction piece, etc...


If you wanted to do a hole that did not go all the way through an object, you could still do that with a boolean but you would need to extrude the curve into a solid yourself, extruding it to the depth you want to make the hole and then using that extruded piece as the cutting object in the boolean rather than the curve.

When you do a boolean with a curve, the extrusion that it automatically produces always goes through the full length of the object.

- Michael