My initial idea was to make a dampener in the shape of a k. I figured that if the letter were fat enough, one string could rest in the stem and the other in the arm and the leg of the k.

So, Cooper Black is pretty fat. That's the Tootsie Roll font. It's been around since 1921 and gets used in some funny places. It's very easy to instantiate letters in OpenSCAD:

linear_extrude(height=10){
text("k", size=16, font="Cooper Black", center=true);
}

If you don't linear_extrude() it, it's not a 3D object and it won't F6 or STL.

So . . . I printed it and it came out great. But I miscalculated and it's not wide enough to be a vibration dampener. Now I have a squishy k to play with.