The print quality isn't the best. But I still think it's cool :) 

Note for the Z=X²-Y² model: The base plate with the axis system and the paraboloid are separate. I had to insert a cut because the prints always failed as a single piece.
Further note: The surface of the Z=X²+Y² paraboloid print is not very smooth.
 

Here is a short summary of my entire workflow to generate the 3d math models:

1. MATLAB Script (Modeling):
   • Defines the mathematical function of the surface (e.g., z=x²−y²), dimensions, and wall thickness.
   • Generates a grid of points and calculates the geometry for a "watertight" 3D volume.
   • Writes this geometry data (points and faces) into a .scad file using the MATLAB functions fopen, fprintf, and fclose.
2. OpenSCAD (Rendering & Export):
   • Open the .scad file generated by the MATLAB script.
   • Press F6 to render the model and validate it as a solid body.
   • Export the rendered model as an .stl file.
3. 3D Printing:
   • Load the .stl file into a slicer program (e.g., Bambu Studio, PrusaSlicer).
   • Adjust the print settings and start the 3D print.