You can do non-printed e-tickets with Tabletop.Events. Even printed tickets may be used with the e-tickets system. 

Enabling E-Tickets

You can enable e-tickets via  Convention Tools > Registration > Settings


Attendees can get to their e-tickets by going to Attend > My E-Tickets in your convention's navigation. There are 3 collection options: no collection, tap to collect, and station collect. 

No collection - You’re not collecting tickets.

Tap to collect - The ticket holder shows their smart phone to the event host, and the event host taps on it to collect it.

Station collect - The e-tickets can be scanned using a 2-d hand scanner at a ticket collection station. You can find this collector in the point of sale system.