Flat horn iPhone4

This is an acoustic amplifying horn for an iPhone4. In this project I tried to achieve a new level of finishing for 3D print parts, to do this, I incorporated a new technique to glue PLA and normal wallpaper as I describe in instructions.

The idea behind this design is to give a mechanical joining between paper and PLA, because when white glue hardness is trap in little holes in the grid structure, obvious these no chemical joining between PLA and white glue.

I hope this technique will be inspire to others ideas, please share this ideas.