how do I convert 3d pdf and .stl to .step
3 Answers
It is possible with Tetra4.
https://tetra4d.com/tetra-4d-converter/
Very expensive for one time use.
This is a very simple model to recreate.
Use this guide/tutorial: Convert STL (or OBJ) Mesh to SOLIDWORKS Model (NURBS)
Remake the model in your favorite software. It should not take much more than an hour.