Homebrew PCBs

Note that for home etching, you probably do NOT want the holes etched.
Or at least, you want much smaller holes etched.  If you etch a hole
the size of the drill, and the drill is off, you end up with the
copper not touching the edge of the hole.

In PCB there's a "drill helper" option that tells it to etch a small
hole (about 10 mil) at the center point to help you center the drill
bit, but not big enough to cause problems with off-center holes.