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Comment by Totodile

First, use the Scour Through Scrap Recipe to salvage Pile of Rusted Scrap. This will result in mostly random engineering materials, with a small chance at obtaining a Prototype like Prototype: Potion Bomb of Speed. These can be salvaged with the Recipe Disassemble Invention to obtain Hastily Scrawled Notes (2-6) along with additional Pile of Rusted Scrap.
Note that the Prototypes have the 'Unique: Prototype (1)' tag, meaning you can only have 1 in your inventory at a time accross all of the different prototypes. You'll want to salvage or use them as soon as you get one.

Comment by Johndudeman

What do you do with the extra notes if you cant learn anything else?

Comment by selerik

The War Within Engineering - Discovery Mechanics (A great idea, or scrap it?)
Engineers can learn 75 new recipes as of The War Within's launch, 50 of which are gated behind Discovery mechanics.

Discovery Mechanics - How it Works

Engineers get started with Scour Through Scrap, taught by their profession trainer.
Scour Through Scrap will quickly allow the engineer to discover the profession's other essential skills, standard parts, and be a rare source of prototypes .
They will quickly learn Invent, which is a guaranteed* prototype each day. (*While supplies last)

Prototypes are single-use versions of engineer recipes which teach that recipe when used.

IMPORTANT: Once an Engineer learns the recipe, they will never receive the prototype version again.

Disassemble Invention can be used on unwanted or excess prototypes (including Unrecognizable Prototype), generating up to 10 Pile of Rusted Scrap and Hastily Scrawled Notes.
Hastily Scrawled Notes create Comprehensibly Organized Ideas, which can only be used to learn Engineering recipes. Neither item has any vendor value or other uses.

Discovery Mechanics - How it Doesn't Work

The discovery flavor and mechanics are built around 3 abilities: Scour Through Scrap, Invent, and Disassemble Invention.
If an engineer learns all 14 recipes linked to prototypes, they will never receive a prototype again.
Instead of Unrecognizable Prototype, they directly receive Hastily Scrawled Notes.

What are the impacts of losing the prototype mechanic?

How many Comprehensibly Organized Ideas does an engineer actually need?

28 recipes require Comprehensibly Organized Ideas to discover them.

How the Engineer allocates their Engineering Knowledge is also important, since three different sub-specialties control access to discoveries..

6 are gated behind Profession Gear, and can't be learned until the sub-specialty is unlocked.
4 are gated behind Goggles, and can't be learned until the sub-specialty is unlocked.
4 are gated behind Bracers, and can't be learned until the sub-specialty is unlocked.

What about when you have invented everything?
There is light at the end of the tunnel!
When you have discovered the final recipe requiring Comprehensibly Organized Ideas , you will cease to receive Hastily Scrawled Notes completely.
Scour Through Scrap will now have a chance to create the finished version of prototyped recipes, such as the tinker modules and potion bombs.
Invent will have a 100% chance to produce the finished version of one of the prototyped recipes.

Engineering Recipes - Source Breakdown

Discovery - Scour Through Scrap: 8
Discovery - Invent Prototypes: 15
Warning: If you discover all Prototypes, you will no longer be able to use Disassemble Invention!

Discovery from Comprehensibly Organized Ideas: 42

Note: All invenions that can be Prototyped can also be discovered from Comprehensibly Organized Ideas.
Discovery Requirement - Goggles: 4
Discovery Requirement - Profession Gear: 6
Discovery Requirement - Bracers: 4

Profession Trainer: 8
Vendors: 9
Quest Rewards: 1
Total Recipes: 75

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Hastily Scrawled Notes

Item Level 80
Binds when picked up

Use: Arrange 15 Hastily Scrawled Notes into something comprehensible.
Requires Khaz Algar Engineering (1)
"Despite the handwriting being your own, the words are practically illegible. At least your sketches get the point across."

Max Stack: 1000

Hastily Scrawled Notes

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