But why should you have a 100% complete industry, a colony can trade with Earth like countries trade with each other, a colony could trade some rare resources and buy high tech stuff.
The main obstacle a colony will have is the initial buildings/bunker with all the life support and safety tech, plus extra redundancy and a backup plan if something bad happens there or on Earth .
If the colony would manage to generate enough oxygen,food, water and energy for itself that is the important first step. Next step would probably be producing the heavy parts they need for expansions like metal or similar solid materials for walls and machinery, the lighter parts could be sent from Earth.
The main obstacle a colony will have is the initial buildings/bunker with all the life support and safety tech, plus extra redundancy and a backup plan if something bad happens there or on Earth .
If the colony would manage to generate enough oxygen,food, water and energy for itself that is the important first step. Next step would probably be producing the heavy parts they need for expansions like metal or similar solid materials for walls and machinery, the lighter parts could be sent from Earth.