I found this tutorial: https://www.youtube.com/watch?v=wWSeZk2IqHg
Transcript (found in the youtube comments)
file -> import mesh
I have used variation on this technique several times, starting from Zheng3's tutorial:http://zheng3.com/2013/01/26/joining-the-voronoi-cargo-cult/
The subdivisions surfaces-->loop stage really affects later steps. More subdivision will allow you to create a more refined and/or more "spindly" voronoi mesh, but subdividing too much makes later computations take a looong time.
Note that the "uniform mesh resampling" stage will fatten up the voronoi lines, so I aim for a slightly more spindly 2D mesh before resampling it. This step can take my laptop awhile to crunch. Often I will run resampling 1st with a higher precision unit (less precise), make sure I like how it looks, delete this resampling, then run it again with smaller precision unit.
Don't forget to save often with meshlab. There is no undo and no autosave!