CO2 bottle refill funnel

thingiverse

This is a funnel designed specifically to facilitate the insertion of dry ice into the SodaStream CO2 charging bottle. I refill my SodaStream CO2 bottle using dry ice, which in my area comes in large blocks that need to be broken down into smaller pieces to fit through the top of the bottle. Initially, I used a standard funnel that fits inside the bottle's opening, but it reduced the size of the hole and slowed down the process of getting the dry ice small enough to pour it into the bottle. This custom-made funnel is designed to fit snugly over the top of the bottle and securely attach to its exterior. By doing so, it maximizes the size of the dry ice chunks that can be inserted, saving me time, effort, and CO2 loss. The cone-shaped design proves to be incredibly robust. As an update, I've added a new file to address the fit issue I encountered with my aged print, particularly with the top of the bottle. The initial version was too tight, causing the PLA material to shrink. It's unclear whether other materials would experience similar issues or not. To resolve this problem, the revised funnel features a larger hole and a slight draft, ensuring a better fit with the bottle.