A holder for tea bags.
It fits and works ... theoretically ... in a dry state ... but ... PLA (or PLA+) and boiling water are not the best combination, if the shape should persist.
A test print with PETG also showed no significant improvement. I just ordered two 50g samples of GREEN-TEC and GREEN-TEC PRO. The result of the corresponding test print will follow in a few days....
Update (one day later): If the holder is printed with Green-TEC Pro filament, its shape remains stable - even if it is left in boiling water for five minutes. -> QED