Beer Bottle Cooler for German NRW 0.5l Bottles

thingiverse

The beer Koozie/Cosy/Cozy/Cooler is a common gadget in US households. It keeps your beer cool during summer and your hands warm during winter. Alas, it is only available for cans or .33l bottles, but not for the European (German) 0.5l bottles. This design solves the problem for the 0,5l NRW bottle (Erdinger etc.) - a version for the Euro bottle (Augustiner etc.) can be found here: https://www.thingiverse.com/thing:5223854 It consists of two parts, top and bottom, that screw together. The thread is a custom made non-standard 6-fold thread triangular that is easy to print without supports and threads quite easily with just a small turn. At the beginning, it might be a little rough, but after 5 times opening and closing, it closes rather satisfyingly. 25% infill makes for a quite durable print with nice insulation because of the trapped air. The bottom has a small 2mm hole to allow trapped air to escape - not sure if necessary. There are different versions for the parts: Bottom: - Bottom_cozy: This is a clean, cylindrical version - Bottom_cozy_handle: This one has a handle so you can use your beer like it was in a mug - Bottom_cozy_handle_snowflake: This one additionally has a snowflake logo embossed to highlight its cooling power Top: - Top_cozy: Clean version - Top_cozy_snowflake: Version with - you guessed it - snowflake patterns embossed All tops and bottoms are of course compatible. Update: I tested the effect of the cooler with two bottles half-filled with water close to freezing standing in my kitchen at room temperature (21,5°). Result is attached: The liquid in the normal bottle warmed up about twice as fast compared to the one in the cooler.