It is a simple yet functional design to use as a Tablet / Smartphone stand.
Can be adjusted to any size just by placing the pieces in the desired position.
It has a 10mm thickness slot, so it probably fit most devices.
The stl file is positioned for better resistance, but you can split in the slicer if you prefer other positions.
Works well on horizontal setup, thou it can be used as a vertical stand too (works but not not recommended for tablets in this position - the tablet might fall)

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Any material you are happy with should work too.