Hello everyone! I'm hoping you can help, as I'm having some trouble with an Item Elevator/Dropper Elevator, that worked fine on 1.7.9.
I've attached a picture of an example built on a test world. This is the exact same design, and was scalable as high as you wanted it. Had like 5 of them in my last build.
Now when I build one, it pulls items from the box and the first and second dropper (bottom to top) catches 1 item each and the whole thing locks up. Sometimes it "may" pull a few items, but never more than 4 or 5 before locking up.
Now this may be a fluke, but thought I would include it.
When built in a SP 1.8 World is seems to work just fine. I ran three stacks of different items and they all went through.
However the exact same design on the server fails.
I prefer this one because it's quiet and compact. Doesn't fool with water / pistons / glass blocks.
Hopefully you can shed some light on what's going on.
I haven't tested it, but, based on the picture, I can guess what's happening.
It appears that the first, second, and third droppers from the bottom are activated in the same tick. Of course, they don't activate at the exact same time. They activate in a particular order which is not obvious from what you see. My guess is, in 1.7, they activate from bottom to top and, in 1.8, they activate in some other order, perhaps top to bottom. You can see that if it is the former case, then the first dropper pushes the item up, then the second dropper pushes the item up, then the third dropper, and so on. In the latter case, it might be that the third dropper attempts to push an item up (but has none), the second dropper attempts to push an item up (but has none), then the first dropper finally pushes the item up, leaving it to rot and mold in the second dropper.
It's also possible that their order of activation changes as minecraft runs or when you reload the world, thus changing its behavior each time you test it.
In other words, use repeaters and stuff to guarantee delays and activation order.
I did some testing with this design in both Singleplayer and Multiplayer, and I discovered that it works no matter where it is. Under one condition. You have to feed the items into the bottom of it slowly. Meaning one at a time.The bottom torch under the dropper powers the hopper when it's on, which keeps it from putting items into the dropper. So when the comparator detects an item in the bottom dropper, it puts out a signal which turns the torch on, which as I said stops the hopper, and at the same time powers the dropper, thus moving the item up. When the item goes up, the comparator turns of again, not detecting an item anymore, and this turns the torch back off, which in turn lets the hopper run again, rinse and repeat. Basically what it looks like to me is that this design should work fine if you just make sure there's always either only 1 or 0 items in the bottom dropper.
-- End of long boring explanation --
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