3D STEP Model Print-Ready

I already have a complete STEP file, but in its current form it can’t go straight to my printer. Using Fusion 360, I need you to re-work the model so that every part is truly print-ready and looks great once it comes off the bed.

Here’s what has to happen:
• Break the assembly into clean, separate bodies so each one can be sliced and printed on its own.
• Identify every hollow or paper-thin area and turn it into a solid, watertight volume without altering the external appearance.
• Keep surface quality and visible details intact, as the final prints are for aesthetic display.

Deliverables
1. Updated native Fusion 360 file with the cleaned-up timeline intact.
2. Exported STEP and STL files for each individual part, verified to be manifold.
3. Quick notes on changes made (so I can learn from the tweaks).

If the model imports into PrusaSlicer / Cura without errors and all parts look exactly like the original design, the job is done.