A 3D printed knot

Here are two photos of the 3D model of the parametric surface:
x(u,v)  = cos(u)*cos(v)+3cos(u)*(1.5+sin(u*5/3)/2)
y(u,v) = sin(u)*cos(v)+3sin(u)*(1.5+sin(u*5/3)/2)
z(u,v) = sin(v)+2cos(5u/3)

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