The smaler pile has to be printer three times
There also exist a one-, two- and four bottle version:
One bottle version: https://www.cgtrader.com/3d-print-models/gadgets/office/sodastream-bottle-dryer-1-glass-bottle
Two bottle version: https://www.cgtrader.com/3d-print-models/gadgets/office/sodastream-bottle-dryer-2-glass-bottle
Four bottle version: https://www.cgtrader.com/3d-print-models/gadgets/office/sodastream-bottle-dryer-4-glass-bottle