Hi Many thanks for your reply
It is a 3.1 Teensy that allows 5V - I am providing the thermal printer with a separate 5Volts.
I also use a 16 character by 2 line lcd display to show day of week/date/time/ name of child whose birthday it is.
The birthday card - with different messages for next 100 years (!) prints out at 8.00am - but i have a push button to allow reprint of birthday card.
Yes - great that I will be able to use the built in RCT.
I also hope to build a magic trick for my 15 year old son who loves magic - and this also will need a (dismantled) thermal printer! so any help with getting this library to work hugely appreciated.
ANdrew