I have used mono, fluoro, and braid. I was wondering which one everyone likes for micro guides. I normally use mono or fluorocarbon with braid as a backing. I am considering using braid with a leader but I cannot get a knot small enough since the guides I am using are a size 2. What about everyone else?

My micro's I use short leaders (2-3ft at most).  Also only run 20-30lb braid and 12-15lb FC.  So I use leaders that I don't have to worry about getting stuck in the guides from casting since they aren't long enough to get that far.

I have used mono, fluoro, and braid. I was wondering which one everyone likes for micro guides. I normally use mono or fluorocarbon with braid as a backing. I am considering using braid with a leader but I cannot get a knot small enough since the guides I am using are a size 2. What about everyone else?

Size 2? Brian.

I use several rods with size 2 guides.  I use whatever line I feel needs to be used.  I don't do leaders though.  

I've never seen a 2mm guide. I thought 3's and 4's where tiny, dang that's small. Brian.

Actually I'm mistaken.  The guides I have are listed as a size 3 but have an ID of 2.05 MM.   I thought they were size 2's but they are called 3's.  Either way, they're really small.

I use all the lines, up to 20lb of each, with tip guides with ID of 3mm

One of my spinning rods is a Ducket MicroMagic, don't know what the guide sizes are. I use 40# superline and sometimes use a 20# flurocarbon leader of about 3'-4'. I have no issues with the Uni-Uni Knot with 6 turns on both knots and the tag ends cut flush with the knots.

I use the fluorocarbon line for weight to make the braid sink for weighless presentations like over there 

 

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I build my own rods and put them on their because it looked cool and they were light weight. I have used the uni to uni for braid and fluoro but I always got a backlash when casting.

When designing a rod build, you match the guides to the line and connections, not vice-versa. A size 3 guide will pass any of the common lines used for bass fishing but my guess is that leader knots are a no go. All you can do is try.