A quick case I made for my new Pixel 2 XL. It's designed for hard plastic like PLA, fits snug and just snaps on. It's a minimal case only 1mm thick with a .5mm lip so you can put the phone face down on a table. Buttons are easy to press, fingerprint reader is easy to find and use and all the camera bits and bobs are exposed including the sensors under the flash. Covers the phone on all side while remaining thin and lite.
Weight is about 11g and it prints in about an hour at .2mm layers.
Edit: Added a solid version as requested. Also added a version that's 1mm longer (Solid Case 1mm.stl) to allow for differences between printers.