This is little ramp or stand that is designed to give cell phones, cameras, flight instruments, or other small pieces of equipment, the ability to be angled for better access or visibility. Velcro may be used to mount a device to the ramp, and the ramp to most surfaces. The ramp may also be designed with screw holes to mount objects in a more permanent fashion. I use it on my flight deck for paragliding and can have several devices set at different angles. the file to print would be instrument-ramp.stl.
If the scale is increased, the ramp could accommodate a tablet or other devices and the hinges could be changed to plastic.
No raft or supports needed.
A small drill bit could be helpful for smoothing the inner bore of the hinges. I use copper wire from #12 romex for a hinge pin.