In article ,
Ernie Leimkuhler wrote:
It is so accurate I plot things life size and spray adhesive the paper
to the sheet metal.
Just cut to the lines and it is perfect every time.
Really great for multiple hole layouts.

A flatbed can also be used with resist ink to directly plot printed
circuits (right on the board) for etching. Great for 1-offs.
Unfortunately, that setup belonged to 3 jobs or so ago, not to me.