I have a 3d Printer .. i am so going to try printing my own grinder on it.. hopefully the teeth will be strong enough
Very cool. You should post updates when you try it.
Also, an electric coffee grinder isn't as bad as people say it is. I've been testing one out, and it grinds the bud to whatever consistency I want (pulsing the blade instead of just turning it on and letting it turn the weed to dust), and separates a lot of kief. The benefit of the electric coffee grinder over even the pyramid tooth acrylic two-piece that comes with the volcano, is that it can get a fine grind even if the bud isn't dry enough to grind very well by hand.
As for the kief you can collect off the walls of the grinder, I examined it next to some kief that has fallen through a screen in one of my metal grinders, and it is very similar. Yes, the electrically ground kief has more plant matter in it, because it wasn't sifted, but if you just sift/rub it on a kief catching screen, what comes through is basically identical to what you get from normal 4 piece grinders. You can always just pour it back over the ground bud if you prefer, as well.
In general, even for 2-piece users, keeping parts 3 and 4 from a 4 piece grinder, and putting your ground bud in there to hold while you have your sessions, and in between sessions if you grind more than you use in one sitting, will collect you a nice amount of kief, without making any noticeable changes to the herb's potency. Each hit is barely changed.