This is my first attempt at making a model from scratch, so any feedback is welcome.

Measurements:

Length: 90mm (80mm + 5mm rounding on each side)
Width: 69mm
Height: 20mm 
Insert gaps: 10mm
Insert angles: 50° and 69°

Fits a Samsung s23 ultra perfectly with about 1mm wiggle room, both vertically and horizontally.

The one in the example is printed on a bambu lab P1S with a 0.4mm nozzle and the “0.20mm Standard” profile (0.2mm layer height 15% infill)