Create customizable and reusable stamps by adding basic foam stickers. To create a different stamp simply swap out the sticker. The handles are large enough that they are easily used by younger kids. And the cover ensures that ink doesn't get all over when in storage.

Printed at 0.3mm to save time. Printing at 0.2mm isn't particularly noticeable and doesn't seem worth the extra time.

Depending on bed temperature and extrusion multiplier the fit between the stamp and the cover may be tight or loose. The current size works well for my settings with PLA and PETG. If it doesn't fit right for your setting, split the objects and scale the cover by +/- 0.5%.