Application with "heavy" printing

Hi
I'm developing an application for a Government entity with lot people gathering everyday
The application prints receipts with barcode for some kind of record tracking in other offices of the same entity.

I've been thinking on using a thermal printer and some customization of
https://github.com/mike42/escpos-php

Or maybe just generating temp. pdf and send them to inkjet printer with (small) custom paper size...

Any experiences about this?

Thanks a lot  

Enrique
https://beza.com.ar