I tried all other models created by others, but unfortunately, they break too soon. I tried PLA, PC and PETG. None of them last more than 3 uses. I decided to create one with TPU. This model is a replica of the real pod with the following modifications:

The height is shorter as the compartment can only accommodate a compressed pod, not an unused pod.

Increased the thickness of the top so that it is strong enough to trigger the top button.

Thickened the base to ensure the bottom button is triggered.

Narrowed the corner to make sure it stays with the lid, no need to lift it when adding water and salt.

Worked very well. So far very sturdy.