Spyderco Sharpmaker Two Stone Minimalist Case

I was annoyed with the basic case my extra fine sharpening stones came with. I wanted something that would lie flat, keep the stones together, did not rattle, and blend in with my other knife accessories. 

The tolerances on the model are as tight as they can be. The portion of the stones exposed allows for them to be grabbed and removed even if the material provides some grip. I included two caps, one cap is sized to exactly the same size as lip, and will likely fit too tight with the base print. A second version is included "cap_f_readytoprint" which has the inside offset 0.1mm from the base . If you wanted the "intended" result, I suggest printing the first and sanding the case lips until the cap is sized perfectly for it

My printing notes:

I printed this in PETG, which turned out fine, but this project is sensitive to dimensional stability above almost anything else. Even without the rods in the case, I am not worried about bending.

I printed the case and cap vertically with a 5 mm brim because the case is so slender compared to height. This yielded good results. One side of the case has enough grip on the rods to prevent it from coming out upside-down. Though this seems to be due to the tolerance of the stone rather than the print. My first cap was base size, and it was tight enough that I had to cut it off. Luckily I was able to slice a corner without damaging the case. That is the need for sanding, and the 0.1mm offset is a little loose. It can hold itself on, but not the weight of a stone while upside-down. I have a 0.1mm offset cap and a 0.05mm offset cap, likely dependent on your filament and print setup.

I recommend printing the case, then the cap based on how well your stones fit. If the case grips the stones, then the cap may only be necessary for protecting the ends. Based on my sample size of 2, it seems its more dependent on the stone, rather than the case.