Hey there, I have the same question, but unfortunately neither restack nor Eggbot optimize paths works for me.
I have generated a file from the weighted Voronoi stippler (http://www.saliences.com/projects/npr/stippling/index.html) and want to optimize it. If I select only a few points (like 200) it works. Sadly it does not work for more than that.
Also output svg of Eric Weeks’ quasi.c do not reorder.
I tried both 32 and 64 bit versions of Inkscape.
Strangley, the builtin Restack also does not work.
Any clues? For most of my work right now, the Axidraw is not very effective because I waste about 90% time with the machine going across the board.