No pockets?
Need both hands free?
Boss calls while climbing a tree?

No problem, here comes the iPhone 4 Necklace ;-)

At first I doubted that this can be printed at all,
but the finished part came out surprisingly well.

It still might not be printable on every machine (holes, overhangs).
I used an Ultimaker, driven by Cura and used these retraction
settings:

• Minimal Travel 5 mm
• Speed 70 mm/s
• Distance 4.3 mm
• Extra Length 0

The STL model has some intersections and might cause
some warning messages with some slicers, but this will
(should) not affect the print.

WHAT TO DO:

• Print this with 100% infill.
• Insert your phone.
• Clamp it with a cable strap.
• Attach a cord (or whatever)

OPTIONAL:

• Cut the cord for (non-free) iPhone 5 upgrade.

BOM:

• 1 printed part
• 1 cable strap (3mm)
• 1 cord (or whatever)