This is a visor and holder for a Kindle Fire. It is not free-standing. The kindle slides in. All slots and buttons are accessible. The camera lens is uncovered.

Creality

Ender 3 Pro

No

Yes

200

10

The Cura 3mf file has a support blocker in it. If you use the STL file it will need a support blocker for the front cross-hole.
Infill at 10%, I suggest Tree Support "Everywhere". Roof and Floor interfaces enabled (thicker is better as the support is trapped above and below).
The "feet" have holes in them. Test fit pieces of filament into the holes in the feet and the matching holes in the visor. Super-Glue a piece of filament into the holes leaving 2.5m sticking out, and then fit the feet into the matching holes in the bottom of the visor. Hold until the glue sets.
The purpose of the long 2mm cross hole is to lock the access tabs in place preventing the Kindle from sliding out. The support blocker will keep the hole open, but the hole may need to have a piece of coat hanger or something shoved through to clean it out.

Slide the Kindle into the visor. Slide pieces of filament into the cross-holes located on either side of the front. The filament should go in far enough to lock the holding tabs in place. They can be pushed into the center gap to remove them.