This earbud holder features:

• Convenient flat storage when not in use
• Business card size, credit card size, and custom sizes
• Quick wrapping action
• Even quicker release feature. The last loop with the audio jack holds the other loops in place. Release it, and you can release all the other loops instantly.
• Customizable location of notch for windings relative to earbud holes
• Customizable width of slots for the cord
• Customizable size of earbud holes
• Customizable corner rounding. Make the corners square, even.
• Optional central holes so you can thread the cord through them to keep it handy while you are listening
• Optional notch for the slide-off side of the winding
• Optional sloped notch for the slide-off side
• Optional tab at the end of the slide-off notch to, ironically, keep the cord from sliding off while wrapping.
• Optional jack notches on the opposite side of the card for more winding options
• Optional engraved text
• Optional additional winding notches
• Improved cord notches to hold the jack

If Thingiverse's Customizer is working, this is your best bet for customizing. If not,

• Install the Development version of OpenSCAD (http://www.openscad.org/downloads.html#snapshots)
• Enable the Customizer according to https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/WIP#Customizer
• Open the .scad file
• Set your customizations
• Render
• Export as an STL file

Not much in presets yet. The Default matches DavidPhillipOster's thing that I mixed from. If you find settings that work well for a recognizable pair of earbuds, let me know and I'll add them to the presets.

Want a feature added? Let me know.

Release Notes
Version 2.1

• Changed jack notch to "T" shape in the middle and flipped at the top.
• Added optional jack notches to opposite side to take up extra cord length.
• Added optional slope to winding side for easier removal.
• Reorganized customizations.

Version 2.2

• Optional engraved text.

Version 2.3
// Adjusted OnePlus presets: larger slots (from 3.3 to 3.5)
// New extra feature: Added a tab to the slide notch
// New extra feature: Added minor winding notches.
// Moved slide notch to Extras

Version 2.4
// Adjusted OnePlus presets:
//// Increase slot_width to 3.7 for OnePlus
//// Decrease earbud radius substantially
// Smaller tab on slide notch
// Minor winding slots are deeper and not added if there's not room
// Bugfix: only printing half a card