Error I have never had before

allenwg2005 wrote: That preamble looks like a worthwhile thing to do.
Now, how do I add it to the post?

You can also add a lot of preamble code to the ini file, so the config starts with those and uses them until it is told otherwise.
You have two tool changes consecutively in that gcode, one without the M6 !

the linuxcnc post processor of fusion does not use G53 at all
try to use the fanuc11m one
just to test

I'm puzzled about that double tool call myself, I have no idea what is going on there.
Something in the post maybe?

I put together a test file to add here, can anyone explain or point me in a direction to address this conundrum?

Thanks as always.

That double tool thing seems to be :
First line with M6 in it is to change the tool,
Second line with no M6 is to prepare the next tool.
Read somewhere that Linuxcnc can do that, so it should be ok.
But i do not know what M1 and M9 do ?

If I recall M1 is a stop command and M9 is coolant off.
I wish I could make sense of the post, I don't know how to code so it may as well be written in Latin.