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Found five arm3 3d models.

free
thingiverse
Palletizing Robot Arm (3DOF, 50cm reach, 125g lift)
free
blendswap
Advanced Industrial Robot Rig V1.1
free
grabcad
Zortrax robotic arm 3D printable
free
grabcad
engine rocker arm3
free
3dwarehouse
Arm3