Got my LDS build set. It fully consumes all of those belts except the steel (two blue belts of plastic and eight blue belts of copper), and doesn't even give a full red belt of LDS.
I'll need three of these, so off to more copper mines we go.
>>536829694
>Put them into a chest with a small limit
>insert from that into a roboport
>connect a wire to the roboport
>read robot statistics from the roboport
>Only insert if there's <500 (or whatever number you want) bots available (not total)
This way, it also inserts more as you build more.