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Part for https://www.shapeways.com/product/7T2E9KAAJ/5-string-electric-violin-body?optionId=81241176
For those who don't wish to use their own ebony fingerboard and nut, here is a fingerboard with attached nut. The fingerboard has the recommended scoop at the fifth (one-third the length from the narrow end) of around 0.6 mm. You will probably want to sand this with fine sand paper, and figure out a way to block the porosity of the material.