Millifluidic Serial Dilution Ladder

A milifluidic chip which takes 2 liquids and produces 5 mixtures with different concentrations when suction is applied.
The concentrations produced from liquids A and B are
100% A,
12.5% A, 87.5% B
50% A, 50% B
87.5% A, 12.5% B
100% B,

The mold for this device can be manufactured by a common FDM 3D printer, then used to cast a negative in 2 part silicone rubber.

https://www.youtube.com/watch?v=dxz10In1774

The next step would be to write an openSCAD script to generate these automatically, with an arbitrary number of layers