I imported a Step file into Rhino. It opened perfectly. It even looks made in Rhino.
I have been asked to modify slightly some measurments. Its just to move faces/surfaces few mm down/up
This is what I would like to move (command —> move face)
I am not sure why when I do this the model gets broken. I believe has to do with something related to Block/instances.
I uploaded the file here so, if possible, you can give a look and help me out.