Hey Chesterton,
I agree with you, Shapr3D is a challenge to use with the Shaper Origin. But I have basically solved the workflow, and it works well. I isolate my design in Shapr3D, then export it to STEP. Then upload in Fusion 360, identify the germain surface, then export to the Shaper Origin. It all works really well. Please feel free to let me know if that does not work for you.
-Tim