My wife was constantly losing my Magsafe to Magsafe 2 adapter. So I printed a small retaining clip/strap to prevent any more lost adapters. When my wife uses my charger, she removes the Magsafe 2 adapter and uses the Magsafe connector in her 2011 Macbook. This retainer clip allows the the adapter to remain attached to the power cord, even when not in use. You must use a flexible filament like Ninjaflex for print and two nylon zipties to secure the printed object to the power cord. I used pink zipties in the photos for contrast. Special thanks to AKAMEDIASYSTEM for the original design.