2 in 1 DIY Sharpening System for knives and scissors
Free plans with dimensions - https://mazaydiy.com/diy-knife-sharpening-jig-2-0/
3D CAD model - https://grabcad.com/library/diy-sharpening-jig-for-knives-and-scissors-1
Previous version - https://youtu.be/w7rPbV5B8yI