Here a very small cable holder for iPhone or Android USB cable
Easy to fix with Double Sided 3M Scotch

Made on AutoDesk 123D Design
Printed on FlashForge Creator Pro 2016 on default blue tape

0.1mm (or 0.2 if you want)
No Raft, no Brim, no Skirt
Infill 20%,
With 1 meter of PLA filament at 210°C and Bed at 60°C
FAN always ON