Oxygen Tank Knob

thingiverse

Recently, my wife began requiring oxygen after her upper lobe was removed due to lung cancer. Thankfully, she's doing well now and the oxygen significantly improves her breathing. Portable oxygen bottles come with a small tool to turn on the O2 once connected to a pressure gauge.\r\n\r\nHowever, I found the included tools frustrating as they're unstable, flat, and extend out over 5 inches/13 cm like a standard wrench. In contrast, knobs are more convenient for situations like this, so I designed two alternatives that allow oxygen bottles to be opened with a knob instead of a tool.\r\n\r\nOne design features "Oxygen Knob" embossed on the top, while the other has a blank top.