its a Basic BumperCase i designed for my Galaxy M20
i Printed it in Amazon Basic Blue TPU
there are 2 small inserts where you can put 2 magnets ( 10x5x1mm ) to keep it closed
the case without the cover you can find here: https://www.prusaprinters.org/prints/126200-basic-case-for-samsung-galaxy-m20
i wanted to upload the *.stl but the website tells me its an invalid file format ? -_-, so i opened it in cura and saved it as *.3mf ( ignore the slicer settings within because they most likely wont work for you )
The author hasn't provided the model origin yet.