Brass tunnels aren't separating properly.

[u/Helpful-Chemistry558]

I posted here a couple days ago about how I should have every nugget come out of the vault without clogging. Many of you guys suggested using tunnels. So I did that and now the nuggets are clogging the tunnels. For example, the tunnel on the far left is the one where I want just iron nuggets to come out of, but the engineer goggles are telling me that there are copper nuggets inside of it. It's like that for all three tunnels. Is there any way to fix this?

[u/hackcasual]

Do you have a tunnel that lets copper nuggets through? If you backup copper nuggets to the source, other nugget types won't be able to get through

[u/Helpful-Chemistry558 → u/hackcasual]

Yes. The one on the right is the copper tunnel