Remove the add-only smelter hopper warning or am I doing something wrong?

[DaveKap]

I want to increase the amount of space of what the smelter output can handle, so I figure I'll put 3 hoppers connected to it instead of 1. Unfortunately, once I set the hopper next to the smelter as "add and remove" so it can move the bars along to the other hoppers, I get a consistent warning that I need to set the hopper to "add only" mode.
Is there some way to permanently get rid of this warning or am I dealing with increasing hopper space for the smelter incorrectly?

[pHredric]

The warning is there to make sure you don't accidently (you may choose to do so as a design decision though) fill your ore input hopper with bars until you have no more space left for ore to grab. As long as you have a workaround design around that problem you can ignore the message, but I highly recommend a dedicated input and output hopper on almost all machines.

Now to the problem at hand, sadly your idea will not work as the only thing that gets shared between hoppers are ores, coal and terrain blocks. I would (and usually always) add one line of conveyor leading to another hopper using another conveyor to another hopper and so on ferrying the bars further and further along the system.

[mudfarmer]

Are you saying you want the three hoppers next to eachother so that they share bars? If so then no, that wont work: ores can be shared that way but bars can't. To make more output space, place conveyor belts beween the hoppers. A hopper can always push to a belt regardless of its setting (as long as it is not locked), so no need to switch to add/remove for the one next to the smelter.

[DaveKap]

Yeah, I now understand that hoppers don't share bars (thanks to trial and error + this thread) so of course the next step would be to use belts. What I didn't know (thanks specifically to you, mudfarmer) was that hoppers would push to belts even if they're on add only! So, thanks for that note! =)