The guys over at www.mmoviper.com have released their crafting bot for FFXIV. With the bot you can easily (within 5 minutes) have a crafting bot up and synthesizing all night long for you. This synth bot is easy to set up. You just tell it what you want to craft, how many times, and what buttons you want to press during the synthesis. And let the bot do the rest. They even have it so that you can repair your gear after the crafting session, or during the crafting session. One user posted his setup that will craft 150 times, then repair, then craft another 150 times!
Its pretty easy, check out this setup video:
http://www.youtube.com/watch?v=A88F_v9ZDco