My tablet cover only has two positions, both oblique. To look at the tablet lying down I keep it in the vertical position, and since the cover does not support this option, I constantly had to pick it up from frequent falls.

So I modeled a very simple block for the vertical position, to put between the tablet and its cover.

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The thickness of the tablet slot is 8 mm, and it supports most devices.
In particular, the tablet shown in the photos is a Samsung S6 Lite.

To interfere as little as possible with the light coming from the screen:
a) the layer height was lowered to 0.16 mm;
b) I used a matte effect pla, in my case PLA-CF.

To reduce plastic consumption to the bare minimum, the structure is limited to perimeters only. If you prefer it closed, change the parameters in the slicer.

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Print profile overview:

1) Stand (100% X, 100% Y, 66.67% Z).

The 100% size along the Z-axis is 30mm, but currently it is set to 20mm. To lengthen or shorten the piece, change this parameter as desired inside the slicer.

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Relax your back!

And now let's imagine hexagonal pine nuts...