Fits on this part: __raspi_bottom__1_05-RP3BP.STL in Modular Snap Together Raspberry Pi 2B/3B/3B+/4 Case w/ OLED & Fan Options von Sneaks
I tried to avoid any black border arount the display without hinding any of the screen.
The author remixed this model.
Added Window to the top part and adjusted its height.