I modified an older design to fit the iPhone 6 (also added model for iPhone 6 Plus plus). This is a passive amp/speaker/horn/stand for iphone 6 that I modified in Tinkercad (shared publicly there too). I find that it doubles the volume when playing music, although it is a little bit echo-ey (that's the trade-off). The design is really similar to turn of the century phonographs!
I printer with PLA on a raft (on heated bed), came out pretty good, although the "gold" PLA I used is more brownish-yellow with some sparkles... I'd probably do ABS next time...
The original design was: http://www.thingiverse.com/thing:544525
iphone_6_horn_passive_amp_speaker.stl | 1.0MB | |
iphone_6_plus_horn.gcode | 15.3MB | |
iphone_6_plus_horn.stl | 2.4MB | |
iphone_6_plus_horn.x3g | 17.6MB |