This is my version to rise AA & AAA batteries so they can charge properly.
There is a grip area to remove the riser easily. The "bottom" part of the riser is flat to enable a good access to the batteries.
It is also possible to leave the riser in place and even use them while the charger is mounted to a wall. They will not fall out.
I printed mine in ASA but every more heat resistant materials will work too. I would not recommend PLA.
Have fun and keep printin!
Update 17.01.2024
Added a V2 Version with a higher middle part to fit even more charger.