score:2
The Egyptian Government's e-Visa portal, under "What is an e-Visa" says this:
The link to download your e-Visa will be emailed to you. Passport control officers at ports of entry can verify your e-Visa on their system.
Further down the same page, under "Requirements," this appears:
Entry requirements (on arrival)
Passport valid for at least six months from arrival date
e-Visa printout
Thus, you should carry a physical printout of the e-Visa. Given the clear statement that a printout is required, it's likely you'll be denied entry without it.
The second part of your question is how to get a printout when you're already at the departure airport. I'm sorry I cannot help with that. I'd start at the airline ticket counter, or the airport information kiosk, or see if there's an airport business center.
Note too that depending upon what country's passport you carry, you may be eligible to apply for a visa upon your arrival in Egypt.