This was a very satisfying build. Just one note: the holes in the spindles don't work with 3mm filament. Rather than hacking the STL, I just dropped one on my drill press and drilled it out. But if you ever mod these, you might want to consider one set of 1.75mm holes and one set of 3mm holes. Still, very, very satisfying. I'll be mentioning them in an upcoming article.