Imported stl model looks totally black

[Jorge_Savran]

Please could you help me with this?:
https://www.babylonjs-playground.com/#71GS5Z#1
After importing the stl file, it looks completely black.
It may not be done correctly, but in some viewers it looks fine.
This model is from here https://www.thingiverse.com/thing:1001001

Thanks a lot !

[sebavan]

Your model normals are all 0:

So in this case it is impossible for us to lit the model properly.

You can nevertheless create some manually: https://www.babylonjs-playground.com/#71GS5Z#2

[Jorge_Savran]

Thank you very much, it is what I was looking for.