Medical oxygen bottle wrench opener

We had a customer approach us wanting us to design some form of wrench that allowed her husband to change and open his oxygen bottles that he required for his health.

We came up with this model that worked really well. Printed off a handful at no charge and decided to share the model with anyone else that might find it useful.

Internal diameter is designed to squeeze down on a 20mm twist top. Scale part up or down to suit.

No post processing of the print should be required. Except perhaps for a quick rub down with sandpaper to ensure there are no burrs on the handle.