This is a replacement power button for the Hudl 2, the 2014 Android tablet by Tesco. It has an unfortunate flaw where the power button is suspended on a thin silicone layer that snaps when flexed beyond its limit, which becomes easier and easier to do by accident as the silicone blob becomes compacted through repeated compression over time. This model is a replacement for the entire button and does not make use of the original flawed mechanism.

The button should be inserted so that the first layer (the one with the build plate texture etched into it) faces towards the tablet's display. iFixit has a guide on the procedure to open the device.

(Updated to add: Cura appears to import the model upside-down for some reason, even after applying the transform in Blender. Please rotate it 180° on the Y axis, it should not require supports in its correct orientation.)