there are plenty of these on thingiverse but i wanted to do one myself so here is my version. Its supposed to fit my galaxy S6 but i haven't printed it yet. :-D I will soon tho. ;-)
It's ONLY for the S6... It do not fit S6 edge or S6 plus, S6 plus edge.
EDIT: Printed it today 2016-10-12 it was little to tight so uploaded a new version :-D
10-20% for the base the pipe and cone 100%