Xiaomi Redmi Note 5 Pro Case Flex

The case is modelled to be printed with a flexible material, e.g. I used TPU. 

It might be too tight for PLA or other stiff materials and the buttons might not work. 

I prepared a few models with various wall thickness on the side and bottom (1.2mm to 3.0mm) to accomodate different nozzle sizes and wished rigidity / chunkyness of the model. 

I was using a 0.6mm nozzle and set the thinkness to 1.8mm (3 perimeters). With a 98A TPU that resulted in a good compromise and the friend I printed it for was very happy. I would probably go for 2.4mm or even 3mm, if I printed it for me, as I would prefer to have it a bit heftier and more rigid. With the different thicknesses, you can choose your own adventure but I would probably go for 1.6-2.4mm! 

To get the nice pattern on the back that you can see on the photos, I used transparent filament and set the botom and top layers to 1 and chose an infill pattern I liked to shine through (~20% gyroid). Honeycomb would also look pretty good, I suspect. 

Note: I adjusted the cutout for the camera on the back to fit better than it does on the photo.