One Way Walls
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The only reason I can think of for this is that portal takes particles in a certain way and they emerge a random different way, so say you had to accurately drop something through it - it would go everywhere. You could, of course, set a different channel for every pixel but it would be easier just to leave it. It could be handy in some situations but it's fairly telling that offhand I can't think of any.
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Use a simple PIPE + DMND Combo
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@pullerrush (View Post)
Use Catelite's awesome PIPE speeding tutorial, it'll make stuff go faster.
TL;DR: Make one-pixel pipes next to each other a lot.
