[account42]

YMMV but in my experience, instances where you need to provide a physical signare but are not provided a printout are pretty rare. Rare enough that you can use a printshop or similar service.

Bording passes are are almost always provided for you on check in for international flights (all you really need is your passport). And honestly I can't recall my phone battery ever reaching 0% - then again, battery lifetime is one of my primary criteria when choosing a new phone. There is still some risk that the phone blows up (literally or figuratively), but that's getting into theoretical territory.

I do have a printer for convenience but it's rare that I actually need it and I have lived for long stretches without one.