Most of the blue enemies spawn on the lower platforms.
Sitting around trying to kill 1 blue guy every 30 seconds isn't going to work.
Only 1 player needs to be on the middle platform
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I just have 1 or 2 people in the center and 1 on the one of the outer platforms and than they just kill a blue and launch the batteries up to the center platform and someone up there picks it up and throws it in. Me and my friend play a game of catch it’s pretty fun actually. He throws it to the center and I try to catch it in the air and throw it in. Makes the forge just that much more fun.