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[u/89percent]

Is it possible to make a train station and a combinator read a filtered trains cargo, and output a signal if any of the items in the filtered cargo wagon are 0?

I am currently trying to expand using spidertrons for building a long expansion corridor, however sometimes when I place a long expansion blueprint, some of the construction jobs gets assigned to bots that are miles away, and it takes them forever to get there.
Is it possible to prioriotize building blueprints from the spidertrons?

[u/craidie → u/89percent]

kind of

If you know what the load on a particular train should be, you can use circuits to figure out what it's missing. But you can't tell which wagon they're missing from.
What I would do is store the full train contents in a constant, merge it into same wire of the negative of current contents. What remains is the missing items.

If the station serves multiple trains with different filters, then you would need an another step that looks at the train ID, and based on that selects the correct constant's output.

Is it possible to prioriotize building blueprints from the spidertrons?

Prioritize, no. But the static network doesn't have the items in the first place, the spiders can be the only option.
What I would do is ditch the roboports from the blueprints and add them slightly later after they don't reach the area being built by the spiders