Part of the body of the VR glasses broke. I want to print on a 3D printer, how do I do it?

Question

3D printers

Everything, as in the question - the strap mount failed. I wanted to buy a new one - replacement is nowhere to be found. But there is a 3D printer, which has so far been idle. But there is no such detail in any catalog of models.
How to create a model and print?

Answer 1

There is a rather detailed article on Habré How to make your first 3D model?
Finished model for slicer and printing.