The PlayerCrafted Event is fired whenever a player crafts something. Which to be more precise, the player takes out the result, not changing something in the grid.

You will need to cast the event in the function header as this class:
crafttweaker.event.PlayerCraftedEvent
You can, of course, also import the class before and use that name then.

PlayerCrafted Events implement the following interfaces and are able to call all of their methods/getters/setters as well:

• IPlayerEvent

The following information can be retrieved from the event:

ZenGetter	ZenSetter	Type
ZenGetter output	ZenSetter ​	Type IItemStack
ZenGetter inventory	ZenSetter ​	Type ICraftingInventory

The following information can be retrieved from the event:

ZenGetter	ZenSetter	Type
ZenGetter player	ZenSetter ​	Type IPlayer

ZenGetter	ZenSetter	Type
ZenGetter entityLivingBase	ZenSetter ​	Type IEntityLivingBase