For my 3D printer, I am currently using the existing M1xx convention to do things like set the extruder temperature and set the cooling fan speed. The problem is that this causes a brief pause in coordinated motion as the whole of LinuxCNC comes to a stand-still, my shell-script is executed to set a HAL signal value, and motion resumes again. Each pause winds up turning into a small 'blob' of plastic as the extruder oozes a bit while it remains stuck in one spot.
So...is there a way to communicate arbitrary values from gcode to HAL that doesn't cause motion to completely stop (or to stop for a lot less time than it takes to launch a sub-process running a shell script)? -- Charles Steinkuehler [email protected]
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