With all of the pre-flop raise sizes and 3bet sizing, mine change a lot.
UTG=5bb, MP/CO=4bb+1, Button if there's one or more players before me 3bb+1 per limper, if it's folded to me, 2bb.
If you've got anything less than agro maniacs on your left then your button range is going to be way wider than the blinds. Mine is only at 40% but I'm definately -EV post flop button vs blinds (for example I might have K3s and they might have KT), I think I need to work on my cbet sizing compared to their fold to cbet % because I've probably been losing money with my air on that one against a lot of opponents... but that's really a different subject, anyway the point is a button range is really weak so I exploit them pre-flop, which is why I use 2bb. Edit: I exploit them pre-flop with my entire range. I am obviously hugely +EV with the top of my range post-flop, but that's the smaller part of my range.
UTG basically uses the same approach as my 3bets. Build a pot so I can get stacks in early and because people in the tiny stakes I've been playing seem to view bets as an absolute value, not a percentage of the pot, if my cbet is bigger (but still only about 3/4 pot OOP) they'll fold more.
MP/CO is just middle ground, occasionally depending on the table CO may play like the button so those sizes are a little variable.
3bet sizing I definately go for 3x IP and 4x OOP, my entire OOP game is designed to punish pre-flop mistakes and to build a pot that I can comfortably play for stacks in with a 1 pair hand, or be as scary as possible with my barrelling SCer.
With that being said, I really don't 3bet from position much at all (a leak?) and I really only have a value range, obviously if against a thinking opponent I'd cash in this credibility with a lot of bluffs but against typical fish my thought process doesn't really involve "should I 3bet?", I mean, if they're a real fish 70/3, I'll 3bet 88+ AT+ for value but if they're just 30/10 I don't want to 3bet stuff that I can play proffitably post-flop and that I actually want action with (this has lead many times to me calling with a hand like AK and folding on the flop/turn).
I'm completely open to criticism on any of this if anyone sees any faults (and you should).