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So it's probably 100-1000x as expensive as silk? That's doable.

Silk worms make a cocoon, for a spider you would need individually "silk" each one every few days.

You can use spider egg sacs but it seems directly from the spider is more efficient since you don't have to wait for them to make the sac

In addition to the sibling post, silkworms don't need individual living quarters.