This contains the OpenSCAD file, making it completely editable. All measurements are stored in constants and reasonably well documented or named I hope. Feel free to ask questions if they are not.

Created this for a smartphone type "Samsung core prime" and printed it out, works great.

It has rounded corners which we liked more than some other examples with hard corners.

Almost all properties can be changed, so you should be able to customize if for almost any phone or material.

I added a worldmap cutout from the back. Hawaii is sadly missing and so is Antartica.