I will show you all 7 blueprint locations I do not count Piero’s blueprint in Havelock’s room.
High Oversser Campbell
After saving Griff from two thugs you can buy SOKOLOV’S FORMULA and LENS MAGNIFICATION for 200 coins.
At the End of the mission there is a building with a rune in it. The blueprint BONDED GALVANI WEAVE is locked under a desk. The key is in a bottle on top of a shelf.
House of Pleasure
Go to Dunwall Whiskey Distillery and enter the building where Slackjaw is. In the storage room you can find the bluerpint INCANDESCENT PASTE .
At the biginning of the mission enter the first building and go upstairs and the blueprint FOLDED GALVANI RESIN is on the desk together with a key and a mana potion.
Lady Boyle’s Last Party
After getting the invitation for the party you can enter through the door. Turn right to the guard room and the blueprint SPIKED GRENADE HOUSING will be on a desk with “Medicinal Herbs” in the room.
Return to the Tower
The blueprint SMALL-SCALE COMBUSTION REFINEMENT is sitting on a table in General Tobias’s room on the second floor.