@Pedro ******
you have a fairly good chance to be accepted visa-exempt for a second time, since you won't have maxxed out your first visa-exempt stay. However nobody can give you any warranty on this. It is up to the discretion of the Immigration officer you are standing in front of. On your second visa-exempt entry, make sure you got the THREE proofs: a booked accomodation, a flight out of Thailand within 60 days and 20,000 THB or equivalent in cash