I've thought about building a version of gadgetbuilder's 4-facet sharpener (to be found ) but for now have decided to see how the Vevor does.? That vendor can be a mixed bag in terms of quality so it's a bit of a gamble on my part.? I should know soon, I just got a notification that it will arrive sometime between now and 8/12.? Hopefully in one piece.
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The Grizzly version uses ER20 collets but it remains to be seen if the Vevor does.? I didn't see any specifics in their product literature.
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Gadgetbuilder's design has been built by quite a few other folks, including one version that uses mostly 3D printed parts.? Lots of interesting variations, the main thing is to achieve the right geometry for the profile(s) you want.? IIRC, some folks have built adapters for it so they can sharpen end mills.? Probably just the bottom face, that's the easiest to sharpen.
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