About this 3D model

First iteration of my harmonic gearbox with 20 to 1 reduction ratio. Still working on next iterations, also for nema 23 motor. I will be grateful for any comments regarding my design. The HG_flex_stator_38T part should be printed with TPU, recommended 95A. BOM: 19x 6mm steel ball 1x 6808 bearing 2x 6804 bearing 4x M3x8 flat head screw 2x M3 threaded insert (optional) 2x M3x4 grub screw (optional)