This is a thin iPhone 7 case, designed completely from ground up using Apple's case specifications, It has the same curve and corner rounding of the phone itself.
The tolerance are tight, it is a trade-off between tight fitting, but just flexible enough to snap over the phone. It was designed for rigid filaments,
This is a very slim design, which is my personal preference, but such that it still can can be put face down without scratching the screen.
The pattern for this design is based on the holes punched in sheetmetal, i.e expanded metal.
For printing I have added anti-warp discs, just snap then off, and maybe smooth any sharp points with a lighter. Any form of warping will prevent the phone from fitting properly. After printing clean any residue or whatever from the inside curve, any blobs will also prevent the phone from fitting properly.
I printed at 0.2mm layer and at 20% or more infill..
if you are looking for some of my other case designs :
an iPhone 7 case see thing here https://www.thingiverse.com/thing:2404836
an iPhone 6/6s case see thing here https://www.thingiverse.com/thing:1813164
Please note the license, it is for personal use only, with no commercialization