@Alan *******
you can't get a new Kor Ror 3 <- the rose bordered one, that's a one off you get when you register the marriage the first time
You can only get a Kor Ror 2 (or if you were married abroad and registered that marriage here a Kor Ror 22) printed at the Amphurs
Most offices allow you to present one that is no older than 30 days BUT there's a few that require you get one really really close to the day you apply
You need to check with your immigration office and see what their policy is