Hi Michael,

Now that I know what the cause of the "yellow bits" is I went back to the original step file and imported it again into MoI.

Those bits appear to be (guessing here) left over bits of "construction lines".

They clearly not part of the the BLTouch unit.

So I simply deleted them and now have a clean model to import in the future.

Thanks to you.

Still the issue of things like that showing up when undesirable remains - something for you to ponder.

Thanks.

Frederick