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If C is a spherical fusion category, the string-net construction associates to each closed oriented surface Σ the vector space Z_SN(Σ) of linear combinations of C-labelled graphs on Σ modulo local relations, in a way which is functorial with respect to orientation-preserving diffeomorphisms of surfaces. We show how to extend this assignment to a 3-dimensional topological quantum field theory (TQFT), by defining how the surgery generators in Juhász' presentation of the oriented 3-dimensionalarXiv:2206.13262v1 fatcat:qnejlt7skbeorgov53oclrqxv4