It's essential you prepare your herbs with a grinder for vaporizing. Breaking up the herbs increases the surface area exposed to heat, allowing vaporization to happen easier. Ground herb also fills vaporizer chambers completely. But it's important that the herbs not be crushed into a mass that doesn't let the heating air through.
Our original grinder design features blocky teeth that don't crush herbs while they cut.
We have always been impressed at CNC metal grinders that took the place of Sweetleaf, Cosmic and other early brands more than a decade ago. The biggest issue we had was that sharp teeth weren't friendly to fingers. Teeth that are like knives also don't cut the herbs as well as they should. The way a knife shape tooth in a grinder works is to part the herb and compact it off to either side. This causes compressed herb and more strength needed to turn the grinder. We realized the best way to grind is not by trying to "dice" the herbs with a knife, but to sheer the material as scissors do.