1x2 Stacker 12 sources in / 12 sources out

[ornate wadi]

Have fun with that ;D edit (144 items /sec (8640 /min (518400 /h)))
requirements: 12 belt (120/min) in (x2)

[warped wraith]

Blueprint Infos :

Version : 1095 / 0.0.7, Blueprint type : Platform, Blueprint cost : 6,264, Platform unit cost : 4
Building count : 834, Building size : 36x16x3, Building tiles : 926
Platform count : 1, Platform size : 2x1, Platform tiles : 2
Icons : Platforms, <empty>, <empty>, {RuRuRuRu}

[hard girder]

use the bent stacker; allows for smaller designs. Also, doesn't that design rely on having more stacker upgrades than belt upgrades. Normally 6 straight stackers are needed for full throughput