Converting ParametricPlot3D shape to an STL file

I’m trying to convert my ParametricPlot3D to an STL file, but I cannot figure out how. Any ideas? I’ve copied the code below.

ParametricPlot3D[{{x, L[x]*Cos[u], L[x]*Sin[u]}, {x, M[x]*Cos[u], 
   M[x]*Sin[u]}}, {x, 0, 36.1}, {u, 0, 2*Pi}]

Thank you!

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