About this 3D model
The original wood connector is made of aluminum, but it was too expensive for the simple task. For the load that the slats had to bear, the version made of PLA or PETG was completely sufficient for me. My print settings OrcaSlicer 1.8.0: layer 0.2 / no supports / no rafts / 25 or more fill in / upper surfaces smoothed / reduced speed on walls and surfaces