How to stop spindle 3 mm before end of the line ?

Hello everybody,
I am a new user of linuxcnc. I am using ploter cnc that has special pump insted of spindle and I need to stop that pump before ploter will go to the end of the every single line. Let's assume : ploter will go according to the lines, at the beginning of every single line pump would be switched on , if distance to go is 3 mm pump would be switched off and ploter will go to the end of the line. Process will be repeated for every single line

Thank you for help
wojtek

Hi,
Two methods are accepted. I do not only want to divide the line into two

thank you
wojtek

I think we can do that in G code way but every single line must be devided into 2 lines ( one of the line would be 3 mm ) - but I wouldn't like to do that

Could you monitor the pin "motion.current-vel" and have your pump shut off when the velocity falls below a certain speed? (assuming it takes 3mm or more to decelerate from your moving velocity to stopped).

I'm not sure what kind of pump you are using, but can it be driven with a stepper motor?
Then use whatever cam software guys for 3d printing use, It will run the pump backwards a few steps before moving to a new line.

Maybe you can use the DISTANCE TO GO value.
Not sure that a pin existis for this propose but it would be a solution.

There is a pin for distance to go (see motion.9) but it is the distance to go for the current line of code. If your line your marking is a series of connected lines, it would shut off at the end of each segment. If that is what you want then there you go.