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Glad you like it.

I just changed the two parameters I mentioned above and modified the end to look like this:

union()
{
cylinder(h=5.2, r=5.5, $fn=12*PI, center=false);

rotate_extrude($fn = 60, convexity = 10)
foetoscope_polygon();

}

I would just move "t=1.05; // wall Thickness" at the beggining of
the script, just bellow the comments, together with another parameter, something like "phl=125; // Pinard Horn length" and then change ty1 to ty1=phl-26;