If you need a 3D model of the trefoil knot, on this page you can download two versions of this interesting 3D surface.
The first 3D model was created based on a tutorial, while working (or rather practicing) in Blender 3D software. Some time later, when we got interested in TopMod software, we imported this 3D model into it and applied the Rind modeling command. As a result, we obtained another, more complex 3D model. Speaking of which, in mathematics there is a whole branch called the ‘knot theory’ which deals with bodies like this. Accordingly, the trefoil knot is the simplest nontrivial knot; for the average person, however, it is much more interesting how to obtain it, and this is actually very easy - by joining two loose ends of a common overhand knot. If you take a look at the trefoil knot in the picture and concentrate on the previous sentence, after a while, and with a little imagination, you will see what we mean!
Surface 3D model - .igs (Initial Graphics Exchange Specification)