Hello,
I create a custom assembling machine. This machine is placed in "script.on_event(defines.events.on_chunk_generated)" event with :

game.surfaces[1].create_entity({
name=object,
position = {x,y},
force = game.forces.neutral
})

All works fine but possible crafts never updates with tech. Here ...

Hi, cool stuff, it is possible to add an emission of pollution (big one i think) ?

edit : fr local

[item-name]
reactor-plate = Plaque de Reacteur
deuterium-capsule = Capsule de Deuterium
big-fusion-reactor = Reacteur a Fusion

[fluid-name]
deuterium-fluid = Deuterium

[entity-name]
big-fusion ...

I just try it and need to stop due to an error. In your recipe of steel furnace, you call it "steel-furnace2" so you need to delete the "2".

edit : I figured out what is wrong. Compatibility mods problems, sorry. But i have an other problem now, more hard to resolve : lot of others electric ...