I have a simple script filter that I use on some machines to insert the pre/post-ambles to allow some generic g-code to work on several machines.
The echo lines will be inserted at the beginning and end.
Code:
#!/bin/bash
echo "%"
echo "G92.1 G54 G49 G17"
echo "M111"
echo "G53 G0 Z0"
echo "G90"
echo "G64 P0.005"
echo "F80"
echo "M3 S18000"
echo
# The main part
sed -n 'p' "$1"
echo
echo "G0 Z1"
echo "M123"
echo "G53 G0 Z0 W0"
echo "G53 G0 X0 Y65"
echo "G49 G92.1"
echo "M5"
echo "M30"
echo "%"
Just save the script as something.sh (like pre-post.sh), move it someplace such as your config dir. Change the files permission to make it executable. Then in your ini file under the [FILTER] section add the line ngc = /(path to file loacation)/something.sh
You can also do find and replaces and what ever else you can dream up. A script that just finds one line that you always have at the beginning of the file and adds your M8 code might be even simpler (just a single sed line.)
