A small badge that holds 2 letters for labeling. Can be attached with double sided tape or two nails.

The Badge_Glue.3mf/stl and Badge_Nailhole.3mf/stl files contain label free variants. You can use e.g. "PrusaSlicer > select object > Add negative Volume > Text" to add custom labels. Reference the Badge-Example-Print.3mf file for a print example.

Rough Settings: 0.1mm layer height, 0.4mm nozzle, manual filament cange for different colors after 3 layers to highlight the letters.