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Yes that should be cut off. It's just intended to help keep that edge square when printing. Also, after assembly and the neck being tightly screwed, I actually ended up filing/sanding down the fingerboard on this one to be perfectly smooth. The printer doesn't make it as smooth as a traditional ebony fingerboard. In my case the black PLA looked a lot like ebony after finely sanding.
Note: I personally don't paint mine as the paint could flake off, especially under the strings. I just use use an exacto. So I have tried not to sand many parts to keep the smooth color consistency of the PLA. Best of luck!