This is a jewelry box I designed for my kids. I have a parametric drawing of it in OnShape. I made that document public so anyone can go and copy it and modify dimensions to your needs. You can also add customization such as lettering to the cover in the model. Please boost my model if you use the onshape link to help support my kids 3D printing efforts! Keep in mind, to make the lid work, the height and depth are scaled to each other.