1 chamber to 2 presses (1:2)

1 chamber make 25 kg/min of sand at full speed (1 x 25). 2 presses use 20 kg/min (2 x 10). That leaves 5 kg/min of spare sand, so the chambers run below full speed or the surplus is sold.

The raw dust is 45 kg/min if the chamber is throttled to the 20 kg/min the presses need, and 45 kg/min if it runs flat out and 5 kg/min of sand is left over. Both figures are published and both are shown.

Asked for 40 kg/min of moonstone, the solver sizes 1 Pressure Chamber and 2 Stone Presses, with 40 kg/min of dust, 46 kW and $3,420 in total (machines, solar panels and placeholder belts). It agrees with the published ratio.