This is a parametric honing guide, designed in Openscad, to help you sharpen all of your tools! It requires the use of 4 bearings (I used 608 bearings - cheap & easy to find and reliable, but you can use whatever you want!) and is designed to ride slightly above the height of your sharpening stone. 

Unless you happen to be using my exact stone (a trend micro diamond stone), you will need to change some variables, so read below please!

The variables are fairly self-explanatory, but the ones you'll want to modify: sharpen_angle (the angle you want to sharpen at! I use 20 for western knives, and 15 for my Japanese knives, and several options for my plane irons & chisels depending on what they're used for!), stone_height (the height of the sharpening stone you're using right now!), stone_width (the width of your stone!), and the three bearing dimensions (if you use something other than 608's), and lastly height (how tall you want the 3d printed object to be over top of the stone - smaller number = shorter object, and there's a simple error check to keep you from going too small but don't get too extreme!). Otherwise the rest of the defaults should work pretty well! You can mess with wheel overhang and clearance if you want it closer to / farther from the stone, but that's more for advanced users (and I just leave them as-is at 2mm for all my work). Otherwise play around & have fun, and cut through stuff like it's not even there! Oh, and, yeah, be safe!