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I've used this knife sharpener that I printed for a few years now. I thought that it was based on the Russian designed TSPROF, but in looking through the history it looks very similar to the USA Edge Pro Inc Apex designs that goes back to the 1990's. The angle isn't quite holding like it used to. I've got a lot of ideas for my own model, but for now I'm going to print some spacers to help get repeatable angles.
setting the angle on my sharpener
Where I want to place a fixed height collar
16deg 31.5mm 17deg 34.8mm 18deg 38.0mm 19deg 40.6mm 20deg 43.8mm 21deg 47.4mm 22deg 50.2mm 23deg 52.0mm 24deg 54.3mm