You are at a festival, you horn hangs at your hip and as times are good it is full of mead.
Unfortunately this makes moving tricky. This lid for your horn tries to remedy this.
The FreeCAD Model is parametrized so you can adjust the model in the spreadsheet to fit your horn.
For perfect fit, heat with hair dryer, fit to horn and let cool down.
The author remixed this model.
Differences to original: