My daughter's Merida doll got Skywalker'd by the dog, so we worked together to develop a BA prosthetic that attaches with a magnet (her idea!).
More information including links to the magnet and spring at https://dragonmountaindesign.com/2020/02/01/brave-prosthetic/
MP-Barrel (x2), MP-Back, MP-BowArm (x2), MP-Projectile (x2)
Material: PLA
Infill: 20%
Supports: No
Brim: No
MP-MagTip
Material: PLA
Infill: 20%
Supports: No
Brim: Recommended
The author hasn't provided the model origin yet.