In Factorio I usually create transport belts with all required inputs. Meaning throughout my factory there will be a flow of iron plates, copper plates, gear wheels, transport belt, steel, coal, copper wire, electronics, etc. However because there are so many types you are likely to end up with a maze. Personally I don’t mind it but when playing multiplayer this can make it hard to co-operate!

This guide will show the easiest way to automatically produce Green Science Packs (Science Pack 2). This guide uses game version 0.11.6.

 Green Science Packs

Before we can start with automating the green science flasks it might be a good idea to check which inputs are required. The flasks itself are created from yellow inserters and transport belts. To summarize:

Green flask = Transport Belt + Inserter (yellow)

Unfortunately both of these components have several sub-components. Let’s work on these two components chains separately.

Video version

Transport Belt automation

Transport belts require two inputs:

Transport belt = Iron Gear wheel (iron plate) + Iron plate

Main line

Because all our items are constructed from Iron plates we only need a single main line with iron plates. Now simply build two factories next to the line of Iron plates. Keep a gap of 1 tile between them.

Factorio guide green science flaskautomation. Step 1 is to set up one line for iron plates

Gear wheels

The first factory will construct Gear wheels. In order to do that it will take iron from the main line. However here comes the twist: Instead of outputting the gear wheels to another transport belt you insert them directly into the second factory.


Transport belts

Set the second factory to produce transport belts. Again we will take iron plates from the main line. Gear wheels will be automatically supplied by the first factory.



Want to save up a few hundred of transport belts for personal use? If so then I recommend constructing another inserter with a chest. That way some of your output will be stored in this chest. Don’t forget to close some of the storage space or you will end up with 25*50 transport belts!

The complete setup:


Note: The strange bend at the finished product forces the finished Transport Belt to use the right side of the lane.

Yellow inserter automation

The yelllow inserters are a bit more complicated and require three inputs:

Yellow inserter: Electronics (copper wire+iron plate) + Gear wheel (iron plate) + Iron plate

A traditional setup would involve two transport belts feeding these components to the factory. In this example we will simply be using multiple factories with little to none transport belts. In order for this plan to work you need to be able to get both iron plates and copper plates onto a single lane.

Main lines

First we will need a main line that provides both iron plates and copper plates. Construct three factories next to it with a gap of 1 tile.  Construct a fourth factory left of factory two and three. Now provide it with Iron plates.

By letting the copper and iron merge from the sides the required double resource line is created. In this example I also need a splitter to get some iron from the main line.


Copper wire

The first factory will be set to copper wire. Place an inserter so it can take copper plates from the main line.



The second factory will take the copper wire from the first factory. Do this by simply connecting them with an inserter. It will also need to take Iron plates from the main line


Gear Wheels

The third factory will be producing gear wheels. This factory will take iron plates from the main line.


Yellow Inserter

The fourth and final factory will have to b e constructed between the Electronics and Gear wheel factory. Set it to produce Yellow Inserters. Now it will need two inserters to feed the electronics and gear wheels.  It also needs to have access to iron plates.




Green flask automation

After both blocks have been constructed you can simply feed both the finished transport belts and yellow inserters onto a single line. Don’t forget to make use of the left and right side of the belts by connecting from the sides.

A blue factory will be required to automate the production of green science packs (science pack 2). This layout will support quite a few factories so construct a few. Now set them to produce green science flasks our brand new yellow inserters and transport belts. Don’t forget to place power and a few input and output inserters.

Checkout the combined result:

In this example I am forcing the finished flaskes on the left side of the transport belt. They will be stored in a buffer chest that is currently storing over 3000 flasks.

Performance evaluation

On aeide7 suggested I would include some performance evaluation data. So here we go:

This system in it’s current setup produced 96 transport belts per minute. It also produces 60 Yellow Inserters per minute. Therefore the system will be bottle necked to the production of 60 flasks per minute. To construct 60 green flasks per minute you will need about 5 blue assembly plants.

Improved design: +60% production

There is an easy way to balance the design. The new design produces 96 Yellow Inserters per minute (instead of 60), creating a perfect balance with the 96 Transport belts per minute. This design will need 8 blue assembly plants for creating green flasks.


This new design features a new factory (orange) placed directly below the Yellow Inserter plant. Set this factory to produce gear wheels. The required iron is already there.

The old gear wheel factory (red) is switched to produce copper wire. This also means the blue inserter of the new copper wire plant has to be moved from feeding directly into the Yellow Inserter plant to the Electronic Chips plant.

These changes will double the production of Electronic chips and therefore further increase the capacity of your yellow inserter production.

With the last changes we can now support up to 9 assembly plants for green science packs. As I final tip I recommend you  make sure you are using the blue inserters in the factory blocks because the yellow inserts will be too slow to handle this design. The same is true for the blue assembly plants. If you need even more speed then you can always equip them with speed modules or upgrade them to assembly plant type 3. These guys are even faster and can be equipped with 4 modules.


Feel free to request additional information in the comments.

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