Thermal printers for printing electronic receipts and invoices from the POS are configured in the POS Catalog. To register the printer, follow this manual. If you require details on compatible thermal printers for electronic invoicing, see this guide.
The following link shows all possible configurations for POS printers.
Before configuring printers in Novohit, you must verify that your printer is compatible according to this list of recommended printers and you must have configured the printer in CUPS following these instructions.