Belt based storage for 81k items

[gaddhi]

This is my attempt at a belt storage for space platforms.

Storage capacity: 81458 items
Area: 52x52 tiles
Density: 30.1 items per tile (=3.76 straight belts per tile)
Time to fill/empty the belt: 33-36 minutes (legendary inserters: 32 minutes)

BeltStorage.jpg (339.48 KiB) Viewed 560 times

Blueprint: https://factorioprints.com/view/-OBZyyrP5snX9bGUOBPT

[Kalanndok]

Fill and empty speed should be the same as it's just one long belt and it seems to be capped at 30 items per second. Is that correct?

And shouldn't you fill the little 2x2 squares with some more undergrounds?

[gaddhi]

The fill and empty speed depend on the distance to the first red belt from the start and from the end. Since these two distances are different, the times are different.
If I find a way to fill these 2x2 squares with additional belt storage, I will. Currently they are already packed with 5 or 6 overlapping belts, so it's not as easy.

[gaddhi]

I was able to improve the storage.

By improving the corner-utilization, adding splitters for more storage and by using inserters to store additional items, I was able to squeeze in more than 100 additional items from 81354 to 81458.
The time to fill/empty the belt got reduced from 40-45 minutes to 33-36 minutes and with legendary inserters to 32 minutes.