Summary I have built a mobile phone holder for my FRSky TARANIS in order to use telemetry with my hexacopter and my mobile phone. For my galaxy S4 I have used a comercial case joined to the printed piece with double face adhesive band. The arms and the back piece are from https://www.thingiverse.com/thing:349502. The knob for fixing the set is from http://www.thingiverse.com/thing:714498 For fixing the set to the Taranis I have used a M5 threaded rod and three M5 security nuts plus a M5 standar nut inside the knob. For best appearance I have covered the center segment of the threaded rod with grey thermoretractable tube.