Vibrating Lower Boundary – How to Implement?

Yes, mixer_3d is rotating STL files. As you pointed out in usr1_des.f:

! Rotate STL files        
        CALL Rotate_STL(is_1_group_id, 'Z', cyl_center(:), rot_angle(1))
        CALL Rotate_STL(is_2_group_id, 'Z', cyl_center(:), rot_angle(2))
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