I created a few holders for the tools I use based on the popular Modular Rail System by @bitsplusatoms

https://www.printables.com/model/51067-modular-tool-rail-system

I use the modular rail on a IKEA KALLAX door which is exactly below my Prusa Core One.
Some of the tools are from the Prusa Core One standard tool box.

• holders for the common Core One Tools

• holder for a pack of Wera kraftform micro tools

• holder for Lidl pliers and side cutter tools

• holder for a hobby knife

• holder for an electrician slotted screwdriver

• endstop for the modular rail (requires a M3 nut and a M3x6mm DIN912 allen screw
  
  In case you want, here is the Onshape Source for them
  https://cad.onshape.com/documents/bcd0e22dc50f5edb2afe1738/w/59817254ad90e9728d8564f7/e/e564c21ce3bc81cae940fd4f?renderMode=0&uiState=693fbeab23886fa552c1c2e0