Are you having trouble with your in-ear earbuds? I have pretty big ears in an obviously funny shape, cause my earbuds tend to fall out all the time. So I decided it is time for customization!
Flip the ear buds of your headphone inside out
Both of them. Then open one pack of sugru. You can get this magical stuff at www.sugru.com and it is totally worth it. Create a string of sugru that is long enough to wrap it around the base
Wrap the sugru around the base of your earbuds
I used a bit too much in this picture
Flip back your earbuds over the sugru and remove excess if necessary. Press firmly into your ears and open and close your mouth wide while doing so. After a minute, take the in-ear headphones out
Remove potential excess and let the sugru cure for 24hrs. Enjoy your customized in-ear headphones. Afterwards they'll fit like a glove and won't come off anymore. :)
Seal the remaining sugru with cling foil and keep in the fridge for later use.