I have a recycled plastic mayo "jar" that I use to collect sawdust for use in filler applications. In fact, I believe that the jar is actually a mix of sawdust from boxwood, basswood, popular, and pear. Good grief!
Sounds to me like, "All species Matter!" My opinion only an not necessarily that of SoS. PT-2
I like to make my own filler using Titebond Carpenters Glue and the sanding/scraping dust to mix it in by following a light bead from an insuline syringe with a light dusting of a similar sawdust and then sand in an orbital motion over the fill track blending things together at the same time as having the sanding motion better smooth out the hull in that area. Just one method. Rich (PT-2)