Quick & Dirty iPhone6 Plus Tripod Holder - no hardware needed.

thingiverse

Quick iPhone adapter mounts on back of phone, then screws into standard tripod head. Designed to bend and clip onto phone without using metal nut on tripod thread. Made for ease of use and quick prints, but not built for durability or strength - meant to be easily replaceable due to potential breakage from bending during use. Use at your own risk; do not rely on this adapter for critical purposes such as attaching expensive devices to high-risk areas. Printing in low resolution can lead to issues with threading and secure mounting, so make sure to print at "standard" or higher settings for best results, especially if you're using a reliable 3D printer like my Makerbot Replicator 2.