My brother's massage gun has a button on the side which helps to release the battery, which broke.
I had the design made in fusion as a part like the original and it works perfectly..
I know the chance is very small that someone else has the same problem but in case, you have the file here, note that there must be a spring behind to support the mechanism to sit well on the massage gun behind the 3D printed object
Support:no
Perimeters:5
Infill: 100%
Filament: PBT+ cyber yellow
Model of the massage gun is: recoveryM8
The author marked this model as their own original creation.