I have a pair of Ety 6i with Custom-Fit tips. I find that the tips just keep coming off the headsets. The tip provider (Microsonic) has made a few replacement tips, but usually within weeks, they pop off too.
To give you an example, take the 6i's out of a pouch, one of the tips will have come off and still be in the pouch.
Perhaps the 6i's are not ideal candidates for the Custom-Fit Tips. There really isn't much on the IEM to grab onto.
Have you, perhaps with other Ety models, had better luck?
If you have a pair of Custom-Fit tips for your Ety's, please let me know:
1. Do the tips come off too easily?
2. What model Ety do you have?