This is a solve-able problem.<p>First, we need to gather data regarding the frequency of leaving these notes. I suspect this is practically exceptional given the required costs associated with requiring a signature (only anecdotal but even more expensive purchases I&#x27;ve made almost never need a signature).<p>Once you collect data that&#x27;s your baseline for the printer&#x27;s reliability. It must work at a minimum that many times per delivery route (in practice it probably doesn&#x27;t). There are dozens of options for small, portable printers that are relatively inexpensive. So even before you start custom designing a more reliable printer get the costs of purchasing them in bulk and pilot them in an area attached to mail carrier bags.<p>Fading &#x2F; inking coming off would be an edge case; the vast majority of these notes are going to be basically warnings that you need to pick up your package or asking them to redeliver it and you have a very limited amount of time to do this before it gets sent back.<p>Packages have barcodes, have the printer scan that to instantly generate an appropriate label.<p>It&#x27;s not the easiest thing in the world but I could put together a pilot for this inside of a week with proper USPS API access. Get into a fast iteration cycle, increase reliability of printers and prints, automate changing of ink and paper upon delivery route completion through some docking mechanism.<p>I almost want to just start building this thing, ha!