To see which part has to be printed who often, see the ReadMe file
There also exist a one-, two- and three 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
Three bottle version: https://www.cgtrader.com/3d-print-models/gadgets/office/sodastream-bottle-dryer-3-glass-bottle