Viesturs Lācis wrote: > > It just does not make sense to me to treat extruder as another axis, > whose velocity would determine the amount of extruded material, > because the machine is going to move the extruder along its > coordinates at a given velocity, determined by F word in g-code. I do > not see a way to control the velocity for A separately from XYZ. > Better yet, in HAL you can compute vector velocity of the X & Y axes, and then multiply by the S word. This way, the extruder will accelerate and decelerate with the movement of stage. You might need some additional trickery to manage the pull-back of the extruder when S is set to zero (extruder off).
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