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I have spent time making and testing these setups. They are not optimal in cost to build (more splitters than is strictly necessary) but I prefer them because their structure and aesthetic lend themselves to clean factories.

This set of tiles all have the input lines going the OPPOSITE direction of the output lines, so that they can point at the main bus that the inputs are fed from. I have versions of these with the inputs and outputs pointed in the same direction as well.

2 belts out, 1 belt in per side



Blueprint: http://factorioblueprints.com/view/FtKYChMcnj57YjrhR

2 belts out, 2 belts in per side



Blueprint: http://factorioblueprints.com/view/3nkeEFxzqB9CtQyDH

2 belts out, 1 belt in per side + requester chests



Blueprint: http://factorioblueprints.com/view/TcmH2csYb5TXj7npn

2 belts out, 1 belt in per side + fluid input



Blueprint: http://factorioblueprints.com/view/modpsjCeHF9kShxEf

The belt compression calculations for each blueprint are in their description on the Factorio Blueprints website. As noted there, they assume that you can definitely provide all the inputs (even if the input belts in the design are not enough), and that no modules or beacons are used. So they are the MAXIMUM number of tiles you will need for a given assembler tech level.

Can you post a screen of it in action? I'm having trouble visualizing how this splitter setup works on the outputs.

AutoMcD wrote:Can you post a screen of it in action? I'm having trouble visualizing how this splitter setup works on the outputs.

I will in about... 7 hours when I get home from work. But essentially, the assemblers only insert on the outside lanes and then there's a 4 to 2 lane balancer which forces full compression on the two inner lanes. This ensures that no assembler will ever have problems with the inserter being blocked when the belt is uncompressed. It can be done with MUCH less splitters, but I like this design from an aesthetic point of view and really the resources to build this many splitters aren't that big of a deal. It's not like I'm going to actually run out of iron or something.