Two versions of each piece are available. Base Ver. 2 has the extra feet extensions to prevent devices from slipping off and will accommodate devices up to 14.5 mm as it is designed. Should easily adjust to accommodate thicker items. Print with at least 10% fill otherwise they will be too bouncy.
One version of the back has flat edges and rounded corners on the top while the other has rounded edges and normal corners on top.
As I am trying to post this the site keeps crashing when I try to insert links to the stencils I used for the finished backs I have provided. Description of the files are : Box Stencil by cSandra at printables and the flag is USA flag stencil by BB TECH on Thangs. The box style is 110mm and the flag is 120mm long. I feel the 120mm length looks more proportionate to the rest of the design but 110mm works and is the one holding the tablet in the pictures. Everything is 3mm thick, plenty of room to do multi-colored prints. The tab insert is 1.5mm thick and could probably scale down if you want a smaller unit.
The feet were taken from Phone Stand by dtylerb at thingiverse. Should you need to redo the holes for the feet after resizing, hole is 1.25mm deep and use 8.2mm diameter if you want a tight, glue free fit for TPU.
You can also combine the two pieces easily in Tinkercad to print as a single item. Tilt angles are based on 22.5 degree increments for ease of lining up.
Added a back design for Mother's Day on 5/7/23. The images are embedded 1mm deep. I used available online stencils. Filament change at layer 6 and 11 if you want the back and front of same color. Otherwise just one change at layer 11. Used a .4mm nozzle with .2mm layer height.
Enjoy!