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					Originally Posted by Jarkko  
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					Originally Posted by Debaser8  Do the runebreaker/runesmasher things stack? Can I put 4 on a 4 armed chassis for massive penetration? |  No, same items do not add the bonus several times. You could addan item to misc slot though.
 
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					Originally Posted by BlanketThief  Two or more of the same item generally don't stack (An exception being bracers of protection) |  Generally true. There are however various items that do stack, like the supply-items (if you ever wanted to stack those on a toon) or water-breathing items (like Sea Kings goblets). I *think* the no-stacking rule is "only" relevant to path-boosters, penetration boosters and resistance boosters. | 
	
 The no-stacking rule also applies to supply-items (As in two different bonuses do stack, but two or more of the same do not, unless you're referring to a different no-stacking rule?) Can't say about the water-breathing items, as I've never tested them. Assuming we're meaning stack as in applying the same bonus multiple times to a single unit, given that your two examples there could be interpreted as otherwise. 
As a side-note, items that cast spells through-out battle will stack in that aspect if you equip multiple instances of them (i.e. 4x Scutata Volturnus on your 4-armed chassis is 4 instances of shocking-grasp, but only 50% lightning resistance)
Should also be noted that separate items that apply quickness (Jade armour/boots of quickness/Champions Trident, along with a W9 bless and presumably the spell quickness) will not stack in that area, however items that increase resistances (Alot.) will stack as long as each instance is from a different source (Brimstone Boots + Ring of Fire = +200%  fire resist)