This is my CAD for my custom Airpods cases. There is a model for original v1 Airpods, Airpods Pro, and also a holder to hold both cases on a table. You could 3d print these in either TPU or PLA.
https://cad.onshape.com/documents/af92349cdac9716456afcdb7/w/d3aa52e6568473c10a59d4fe/e/dfcb7892fbfa8b6cba86f839?renderMode=0&uiState=668c8d8a1bca2341b2f4ddc1 Copy the OnShape document to modify.