  We have studied the connectivity percolation transition in suspensions of
attractive square-well spherocylinders by means of Monte Carlo simulation and
connectednes percolation theory. In the 1980s the percolation threshold of
slender fibres has been predicted to scale as the fibres' inverse aspect ratio
(Phys.~Rev.~B {\bf 30}, 3933 (1984)). The main finding of our study is that the
attractive spherocylinder system reaches this inverse scaling regime at much
lower aspect ratios than found in suspensions of hard spherocylinders. We
explain this difference by showing that third virial corrections of the pair
connectedness functions, which are responsible for the deviation from the
scaling regime, are less important for attractive potentials than for hard
particles.
