I understand a major problem with custom molds on Airpods is that they have to be removed each time the Airpods need recharging. I would be interested to know of custom molds where this problem doesn’t occur.
Honestly I don’t think trimming the charger would ever work. The whole charger is so so tiny and the part where the eartips sits is only a few MM thick near the lid. There’s just nothing to trim there. If you trim below in the charger itself, you risk puncturing the battery.
I think the only way this works is to get better eartips for the airpods. For my money the airpods 3 have really good eartips even for my stupid big ear bowls. I find the sound of them as ’s really good and they last 8h on a charge now which is great. If people worry about battery drain, buy 2 sets and it’s still like a 10th of the price of regular HA’s