Hi Juan,
OptoPCBA & OptoPCBB parts are the opto-isolator sensors. You can find the kicad, gerber and drill files at https://github.com/AngelLM/Thor/tree/developer/electronics/opto-isolator
Also, I don’t know if it is possible to reduce the speed of the animation using the Exploded Assembly workbench… Maybe clicking Play and then Pause quickly could help you.
Best regads,
Angel LM