In our second installment on the Split Face command, I’d like to point out a difference between projecting 2D sketches and 3D sketches in XOR.

Using Split Face (found under Insert>Modeling Feature>Split Face), you can project a curve onto a face (surface or solid) and then trim or split that face.  But the projection method is different depending on whether you use 2D sketches or 3D sketches as your too entity to do the cutting. A 2D sketch will be projected normal to the plane that the sketch lies on, whereas a 3D sketch will be projected normal to the direction of the target face.

As you can see, using one or the other type of sketch will let you get the desired result depending on what you’re trying to do.