What airline are we talking about? KLM I presume?

With KL it is absolutely no problem to not print your ticket. At the airport they either have at least one of these:

- Check-in robot that prints the boarding pass, traveller is ID'ed by Passport or e-ticket code
- Check in desk, Passport or other valid ID should be enough
- Ticketing desk with a BP printer

So..no worries. A valid ID will be enough, as long as the details on the ticket match exactly with said ID.