Here is the 2 x 2 System X plate, for example for Playmobil or other dollhouses that are based on Playmobil. The 4x4 and 2x4 plates will follow shortly. This can then be used to build a huge area, for example for the large villa (Family Hauser on Youtube).

The yellow and red pins (Playmobil) sometimes go in tightly.

I printed the model with the Bambu Lab P1S AMS and filament Bambu Lab PLA Color red with standard settings in the Bambu Studio.

I'm still a beginner in 3D modeling and 3D printing.