  We use a large cell Monte Carlo Renormalization procedure, to compute the
critical exponents of a system of growing linear polymers. We simulate the
growth of non-intersecting chains in large MC cells. Dense regions where chains
get in each others' way, give rise to connected clusters under coarse graining.
At each time step, the fraction of occupied bonds is determined in both the
original and the coarse grained configurations, and averaged over many
realizations. Our results for the fractal dimension on three dimensional
lattices are consistent with the percolation value.
