A stamp with moveable types with 3x10 spaces.
PLA works ok with paint, for ink you may need to print the letters with a softer material like TPU instead of PLA.
Depending on the printer resolution it may need scaling for the letters to be printed properly. For bambu lab A1 with a 0.4 nozzle 125% scale prints ok.
No supports required.
To create custom letters I added a Freecad (letter.FCStd inside letter.zip, comes with custom font) file with a sample letter, just modify Letter > LetterExtrusion > LetterShape > String
The author marked this model as their own original creation.