Originally Posted by Guitarnut
Subscribed and watching. I want to see how you tackle the carved portions of the neck. Organic shapes like those are tough. Ask me how I know.
This type of Boolean works better when the geometry you're using as a cutter is outside the geometry you want to keep...a subtraction
Boolean is used. Instead of using a cylinder as a cutter which would leave the fretboard trapped inside the cutter, use an object that looks like a long radius block which would leave the fretboard outside the cutter. Should work every time. Merging points after Boolean and Mirror is also a good practice to ensure you don't have multiple points occupying the same location.
I've found that in order to get boolean to work more often, the surfaces have to be distinctly overlapping each other. Surfaces with common points don't like to boolean for some reason. Also, you have to get rid of all points, curves, surfaces, and things not related to the boolean. I've had more luck just splitting objects and then deleting what I don't want.