A small change, but perhaps rename the item filter to "Copper Hopper". Or just make a note saying that the item itself is not called Copper Hopper.

I spent a little while troubleshooting because I couldn't find the item in creative inventory or JEI by searching Copper Hopper. Found out after crafting it it's called "Item Filter".

Totally up to you but hey, I think it would be a good change. Also I think Copper Hopper sounds awesome

Heyo!
This is a great mod! But I'd like a name change to Copper Hopper, Copper Filter or Copper Hopper Filter as well - just so it adheres to the other hopper mods' style out there ;)

In fact, first I thought the recipe doesn't show up in JEI at all. I was about to write an issue about that until I saw this issue.