My MK4S → CORE One upgrade kit is shipping soon and I'm getting excited. I put some of my energy to work and made this Honeycomb Storage Wall insert that you can mount your CORE One Nozzle Replacement Tool from Prusa Research on.
I printed mine in Hatchbox Orange PETG using the .20MM SPEED and Generic PETG profiles, with 15% Gyroid infill. I didn't need a brim for this part but YMMV.
There are four variations of this holder - a version for both the “Sock” and “No Sock” versions of the CORE One Nozzle Change Tool, and then "direct" and “blank” HSW insert versions of each model. Should cover all the versions of the tool and all the ways to attach them to your HSW.
The author remixed this model.
While I marked this as a remix so that it was linked to the Honeycomb Storage Wall, this is an original design of my own.