This is a hardware question. Is there a class of plotters that are portable and accept sharpies?
The use case: I have a burlap sack. It will be taking very specific potsherds from an archaeological dig. It needs an indelible QR code (or bar code) printed on the burlap. (Stickers have far far too short a lifetime). It was my thought that a plotter that uses sharpies and that works in the field would be the optimal solution for this problem.
Is a portable plotter the right solution? If so, who makes them? If not, what is a better solution?