Great design! I made this a surprise for my Ukulele loving girlfriend. She loved it!!
I decided I wanted to add inlays on the side of the neck. I carefully drilled holes into the side of the fret board. Then I pressed some white PLA into them, and trimmed them flush.
If you use Cura, I highly recommend you try out the “ironing” settings when printing the fretboard_top. You get a much smoother and cleaner top surface, as you can see in the picture. I also included a picture of the ironing settings that worked the best for me (most will need to be unhidden).