By the way, a bridge/titanium conveyor can only move enough titanium to supply about five plastanium factories.

RE: Junction
A junction will only accept up to six items if and only if there is another block on the opposite side, even if this block cannot normally hold any of the item. If you have a line of items going to a lone junction with nothing on the other side, they won't go in. If you place a wall on the opposite side, then up to six will go in and stay there until the wall is replaced with a belt, a container/vault, or a machine that uses the item.

So basically, if you were to place any building, wall, turret, directly above and adjacent to those junctions, up to 12 items would get stuck in them over time.

You'd have to use a plated conveyor or bridge to avoid this, or just don't place anything above the junctions.

cool design, do you have a link t copy?

also having a couple items go into it is fine

They just don't go in it

I'm pretty sure that no items go into a junction if there is nowhere to go

Titanium feed should be a bridge conveyor instead of 2 junctions, to prevent cross feed loss from the top right plastanium compressor. Nice design, otherwise.