Sale to credit- Print of ticket

good morning
I have clear the handling of sale to credit, entrance to documents to make epl process but at the moment of making a partial or total payment of this credit in
and try to print this generates in PDF document A4 size which must be printed in a different printer than the one used for the post system ie the thermal printer.
There is an option to modify this voucher so that it is issued by the predefined printer, whether it is 58mm or 80mm, so that the customer can be provided with a proof of payment.