Nexus7 2012 Holder on chair

I disegned to hold tablet on a Ikea chair in order to watch some movies in babies room.
The pictures show a longer bar instead of the stl file. I fixed lenght.
Consider measures are calculated with a case.
I tried to waste plastic less than possible.
You have to print 2 part of "staffa" and stick them to "barra" with glue.