Knife Sharpener

This was a quick design project that was borne of necessity. I had purchased some Henckels knives from Value Village and needed to sharpen them. I tried a pull-through sharpener I had but it gave poor results. According to the internet, those styles of sharpeners aren’t particularly effective, so I know it wasn’t something I was doing wrong.

One trip to Lee Valley later and I had a set of ceramic honing rods. They included instructions on how to make a wooden base, but I thought this would be a fun 3D printing project, as I could add some of my own features that would be difficult to do with the woodworking skills I have.

Lee Valley’s suggested instructions for making a base

Using the instructions Lee Valley provides as a guide, I modeled a base in Solidworks. I was able to fit four angles (20°, 30°, 40°, and 50°) so I could sharpen thin Japanese style knives that require a narrow angle, or tools that will see rougher use and require a wide angle. Embossed text beside each set of holes makes it easy to know which angle is being used. The rods are stored within the base, and a cap seals it. The base and cap have holes for 6mmx3mm magnets to be glued in, allowing for the cap to hold on tight.

The base and cap as seen in Solidworks

I printed both parts on my Prusa i3 Mk3 using white PLA. Unsurprisingly, many of the holes came out smaller than they were supposed to be. I expected that to happen and reamed the holes with a power drill, allowing for a perfect fit for the ceramic rods. The magnets were glued in with Gorilla Glue (Not ideal because of how much it expands, but I had it on hand) and everything was ready to go.

The complete sharpener ready to use.
The sharpener packed up for storage.
Details of the interior storage.