There are some cases when it's hard to pour a liquid into a standard plastic SodaStream bottle without spilling. For example, if you are pouring water from a Brita filter, or juice from a screw-top carton box.
There are other funnel designs here on Thingiverse but usually, they have a small opening and either don't sit well in the bottle or have strange struts to support them.
This funnel is designed to fit snugly onto the standard plastic SodaStream bottle (when printed in PLA) and provide you a wide opening to pour as fast as you want.
SSBottleFunel.stl | 803.1KB |