These scoreboards have been designed for both the dart games of Killer and 301 (or 501), for 3D Printing.Quick and easy scoring, by using sliding crosses and dial numbering. Chalk free.
Open space to attach calculators, to make scoring even easier if you like.
Updated for printing on smaller 3D printers. Largest size above is about 300mm x 250mm, but I have attached the dwg files if you want to modify the drawing.