Minecraft – How to get spiders to group together in Minecraft

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I have two cave spider spawners that are very close to each other, so I'm trying to make a trap for them.

I have all the spiders funnel into a 1×1 vertical tube, that's 3 high, with an iron bar on the bottom.

But, the spiders get into the tube, and hang at the top, with one going to the bottom.

Is there a design with the current AI, that gets the spiders to bunch up?

Best Answer

Spiders require a different grinder design than most mobs, as they can climb walls. The path they take from the spawn rooms to the actual grinder cannot go down, it must always flow either level or upwards. Water should be used to push them along to the end. Here is an excellent tutorial on making a dual cave spider grinder, which I have personally used to great effect.