Inspired by #chdanielmueller, I designed a colored label for the Bosch / Sortimo L-Boxx system. The label clip is secure and can be easily removed or replaced.
To enable you to add individual lable for your tools, you will find the Fusion360 file attached.
I found the PLA filament in the special Bosch Professional blue here:
https://www.nolec.de/product-page/pla-passend-für-bosch-professional-bosch-blau