Like Skeinforge's Jitter, Slic3r has a method of alternating Z-lift points.
You will need the SketchUp model. A magnifier would also be good for looking closely at the surface results.
We will proceed as follows:
Slic3r only allows for one setting to randomize the Z-lift points. Skeinforge, on the other hand, allows for a degree of choice by adjusting Jitter Over Perimeter Width (ratio). The option to randomize is really the most valuable feature.