Hi! I’m CS master’s student at the University of Wrocław. For a seminar on Game Modding, I’m focusing on Factorio’s modding scene. The Factorio team suggested I should ask the community directly for some of the questions—so I’d be grateful for your insights.

Questions (answer any):

- Most ...

Wanted to ask about the possibility of adding a trigger technology, that requires X amount of power to be produced. The way I imagine it working is that if all prerequisites are met and the power grid is producing the specified amount or more, the technology is unlocked.
(With regards to multiple ...

Thanks for the report however this is simply a case of "don't do that". You're telling the robot logic that the robot must be 100% charged in order to enter the roboport however by existing for 1 tick, it must consume energy and therefor won't be at 100% charge and so can never enter the roboport ...

I was adding a new tier of logi/construction bots to my mod and gave them an increased min and max_to_charge value, so that they would be able to charge from further away then the normal bots. However, when testing this bots out they would get stuck 'charging' (even after filling their battery up ...

Proposed solution of "ignored_by_quality" being an integer has a fundamental flaw that makes it impossible to add: if a recipe would finish, due to value of this field it coukd happen that X items of better quality and Y items of original quality would be given but they would have to be both given ...

I'd like to ask for a way to turn off the chance of getting a better quality item from a recipes outputs, because it can massively intefere with any item-based catalysts in mods.

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Using this recipe as an example - this is the only way to get barium nitrate (and by ...

+1, NothingModifiers already exist for the same concept (fake thing that lets you add custom effects)

+1, literally have been wanting this for over a year for things like fuel-powered generators

+1, seems like a nice feature to have - i can think of a couple mods that'd make good use of this

Bilka wrote: Thu Sep 04, 2025 3:00 pm What happens if there is no more energy left in the energy source?

Presumably it'd just stop working? thats the only way I can see it working personally (presuming you mean "the electric network" in this context )

No I couldn't, using control.lua is not great and should only because there is no other way. Hidden tech is in prototype stage and therefore mostly clean. Doing tons of lua code in control.lua to simulate electric interface is not very clean, anything in control.lua that is not using event is not ...

I don't see why you can't do an hidden tech always unlock. I don't see why dev should add this feature when we can already do it properly. Hidden tech exist for that.

you could say the same for fluid/heat powered buildings, trigger technologies, any modifier that affects an entity (lab speed ...

+1, seems like a cool idea - even if it was a separate parameter and not directly “negative efficiency”

Recipes already can get productivity bonuses from a modifier technology, so I wanted to ask about the ability to give a recipe an innate productivity bonus? essentially letting you arbitrarily set the bonus to any value in data stage, rather than faking it with hidden, always unlocked technologies ...

oh thank you! that is close enough to what i wanted to be added

I’d like to ask about adding a way to set a quality ‘cap’ on buildings, so that a building will never produce something of a quality higher then what the player sets, and anything above the threshold gets turned into the highest possible quality.


So you don't mean the highest possible quality ...

Are you saying you want production to work the same way as now, except that items with a lower quality than the cap...just don't get produced?

A gear assembly machine with quality modules would normally it make a lot of normal gears, fewer uncommon gears, fewer rare, even fewer epic...

So with ...

+1, anything like this should have a connection to the circuit network

This is what the Recycler is for - feed it any Products that you don’t want. You can use a “Quality Level” filter on Inserters/splitters to choose what goes in.

Good Luck!

that still requires extra work to set up, instead of just putting a setting on a building :lol:


That's the point of ...

wanted to add onto this now that i've been playing more space age - a quality cap would be even more useful for when you want to make just an uncommon, or rare, or epic build. I've just turned my red and green science builds into quality grinds, so that i can get epic science; however it'd be way ...