This is the fully revised Version 2.1!
Watch how to make and use one: https://youtu.be/IM2il-zT2fA
Bill of material:
10x 10x2mm disc magnets (https://geni.us/Qgif) Sharp knifes are essential in your kitchen. I was inspired by another 3D printed knife sharpener (http://www.dr-henschke.de/Messerschleifer.html) and adapted the design for relatively cheep Chinese water stones as you can find them on Aliexpress. Additionally I simplified the geometry to reduce the number of parts and to make the assembly easier.
The author marked this model as their own original creation. Imported from Thingiverse.