This is how I understand it.
Angel hair pasta (cappellini d'angelo) is a round pasta; and as such it isn't cut, it's extruded. Any decent extruded pasta is made from very stiff dough, and very fine pastas are made from extra stiff doughs. While it's possible, none of this (super stiff dough, extruding pasta that fine, and handling it after its extruded so it doesn't break) is easy at home.
The less expensive pasta extruders like the Popeil (no slouch, actually) and De Longhi can be had with "angel hair" discs, but they're more like extra fine spaghettini than an actual angel hair -- at least in my opinion. Also, without really powerful mixers, they don't make stiff enough doughs and the result, consequently, tends to be gummy.
There's not much benefit to "fresh angel hair" as opposed to a high quality dry, boxed version. Because it is so fine, it even cooks almost as quickly.
I'm interested in what type of cutters chefross uses to make his flat angel hair. I've never seen any nearly as fine as angel hair for any of of the popular roller/cutters.
BDL