Palm sized bottle opener

The story: My grandfather challenged me to design this after a visit to a local elderly (89 years strong) business woman. During his visit to her shop she remarked she is having an issue opening pop bottles. He immediately challenged me to help her out as he has been doing business with the family for some time. I showed him some designs I found and he wasn't satisfied, he wanted it to be as small as usably possible. The model: This model uses a left hand tapered thread, meaning the more it is screwed onto the cap the tighter it is to increase variety of soda bottle caps it can fit on. All edges are rounded for comfort and safety. A hole is cut into one corner to allow some sort of cordage to be added for hanging/storage. I have tested with Pepse , Coke, and Dr Pepper products. The fit on pepsi products seems to be more snug and may require a slight scaling up of the model (like 1-2%) in the xy directions. Print instructions: I used PLA and it printed fine at 0.2mm layer height. I also