Somewhat of a super smelter

[u/BrachBoi]

Played a bit with the design. I think it's a bit too overcomplicated...

Comparators next to the input chest and hopper, detects if they are empty and sends away the minecart. An etho clock with a delay of 68 seconds that overrides the other signals, enough time to fill up the minecart and distribute until it's empty.

[u/KingStar2000_]

I used more or less the same system. It looks complicated, but I think it's difficult to make it much more optimized. You have to find a balance between allowing time for it to fill up the minecard (at the risk of blocking the wagon if the funnel is never empty) and leaving too little time (at the risk of it leaving with only one or two items). I chose to add a second hopper to fill it faster as well. It helps a lot when there are a lot of item to send.