It seems I haven't been clear enough.

I'll try with an example:

I set my main inventory to have 2 slots filtered for red belts (i.e. 200 belts)
I set my auto trash to take every red belt if I have more than 200 in my inventory (so I have 200 red belts on me when I go away from my roboport).
I ...

Hello

I made a spreadsheet showing all the production units needed to produce evenly all kinds of science packs (except the white/space one).

Notes:

It has been made using Kirk McDonald's Factorio Calculator .
It is set up for the end of the game: assembling machines lv.3, electric furnaces ...

Hello.

I'm quite new to Factorio, and I recently encountered an issue when items I picked up directly from an assembling machine or a furnace didn't go in the main slots of my inventory (e.g. I pick up 10 stacks of 100 iron plates and nothing went into my inventory).

I discovered that the items ...

I also needed a 12 to 9 balancer, so I made one using Bauer's blueprint and three 4 to 3 balancers:
https://i.imgur.com/u1l3qQO.jpg
0eNqdnd1uWzcQhF8l0LUVkFz++lWKoLATtRBgy4YsBwkCv3tlW0pdl7Jmv6sgSjRnzh7ukhzNWf5aXN88ru63681ucflrsf56t3lYXP7xa/Gw/ntzdfP82e7n/Wpxufi+3u4e959cLDZXt88fvP6PZVw8XSzWm2+rH4vL ...