Do I have to print out anything?
Unfortunately, the answer is usually yes. The first page of the PDF voucher is required by the majority of bus and ferry operators.
For train tickets in Thailand, there is no need to print out the PDF. You need to show a screenshot or tell us your booking number when you pick up the tickets in our office or in Bossotel in Chiang Mai.
SeaTran Discovery Ferry requires a printout of the voucher only at few stations in the Western part of the country. Their main counters accept screenshots as well.
You might still consider printing the first page as it contains a map, the address in the Thai language for your taxi driver and the contact number for your booking.