Screw holder for shelf

This design is a lock for securing shelves in a wooden cabinet. It is designed for shelves with screw holes 18mm wide and 14mm deep.The model is reinforced to withstand heavy loads on a shelf and to fit securely into a pre-prepared wooden board.It has a 1mm overhang to adhere better to the board.Its dimensions can be modified as needed. PLA seems to be sufficient in terms of strength.