Hi Antonia,
If you have OnArrival Premium, you can bulk print badges form the OnArrival app by going to Settings > Multi-Badge Printing > Filter by Company, Admission Item, or Registration Type > Click on that item > Select all attendees you want to print > Print Selected Badges.
You can also print from the back end of Cvent through Invitee Management > Manage > Invitees & Registrants > Check off everyone > Bulk Actions > Print Badges. You'd just need to hook up the Zebra printer to your computer with a USB cord in order for your computer to recognize the printer.
Best,
Julia