Is there a magic item that does this? Kind of like Eyes of the Eagle does for Perception?
bump
Besides Golem Manuals there is not a specific magic item that provides a bonus to craft checks. That said, there are many pieces of mundane equipment that provide a circumstance bonus to specific craft or profession rolls, such as an alchemist's lab for craft(alchemy). You could also make a custom magic item, though the rules for pricing can be a bit fiddly.
There is an ioun stone that gives +1 to an int based skill or another for wisdom, Don't forget masterwork tools +2, there is a magic item anytool the counts as all masterwork tools, and it is a simple process to make an enhancement bonus item just cost it at (rank)^2 × 100 and double for slot less, some of the suggestions might not stack because of bonus types though.
There is an ioun stone that gives +1 to an int based skill or another for wisdom, Don't forget masterwork tools +2, there is a magic item anytool the counts as all masterwork tools, and it is a simple process to make an enhancement bonus item just cost it at (rank)^2 × 100 and double if you make it slot less, some of the suggestions might not stack because of bonus types though.
And then there are these amazing tools of manufacture