I don't have any master book 3 and honestly don't feel like going through the trouble of getting scrips to get them when there's nothing worth crafting at the end. For example, master book 3 for Armorer will only have 5 items on it (according to lodestone) - 1 Minion, 2 Bardings, 2 Body Piece. That's it!!! Unless they didn't release all items or they plan to release new recipes along with the Alexander raid, levelling crafting is not worth it imo. The picture they have in the patch notes that shows the new recipes, those are all i145 - i150 items so it's not looking good.

@darknezz - you get the master book 3 by trading scrips. it's next to the npc where you get the quests for specialists, collectibles etc.