@Charlie-83 This test has a method of checking binary file content, in case it's relevant here.

https://github.com/CadQuery/cq-cli/blob/main/tests/test_glb_codec.py#L46

@jmwright Yeah, I did a very similar thing here. Just checking that the first 5 bytes aren't "solid" which would mean it was an ASCII stl. Wikipedia says that the binary format should never start with "solid".

Of course, the binary file could just be a load of nonsense. But, I'm guessing that actually parsing the contents to check it's cube is overkill. I could check that the number of triangles is correct or something since that's near the start of the file.

@Charlie-83 Is this ready for review?

@jmwright Yes, thanks

Thanks for this @Charlie-83 !