Was having clogging issues so I thought I'd replace and get the mythically good capricorn tubes. This is a good sign that I needed to.
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Tighter fitting tubing is actually likely to cause you more issues. It's a myth that capricorn tubing is better in any way. In a way, you want a somewhat loose fitting tubing; especially if you're cheaping out on PLA.
So, say you've got a partial clog -- The thing that usually happens is the feeder will skip/slip or tear into your filament. This causes the filament to go out of round, and can even push the sides of the filament out further than the tubing is wide. This causes the filament to then take more pressure to push through the tubing, adding to the already existing problem.
I'd call it "successful marketing" :) But yeah, they're really managed to convince a lot of people that it has near magical properties, and I've seen a lot of random people recommend it to others for all sorts of issues.