Hi all,
I use Marlin firmware on my 3D printer and tried to improve printing quality by playing around with all possible firmware and slic3r settings.
At a certain point of quality I recognised (like a lot of other users) that the amount of extruded ABS in the corners (where a line ends) is always a little bit to much while there is a little bitt too less material at the starting points of a line.
Root cause seems to be simple:
When the extruder axis starts it takes some time to build up pressure needed to dispense material out of the nozzle. When the axis stops it's the other way around, it takes some time until pressure in the nozzle is released which yields in more material than wanted at the end but less material at the starting point.
Possible solution:
One could improve the firmware in a way that there is a phase shift between extruder axis and x,y axis. So the extruder starts some milliseconds earlier than the movement in x,y starts and the extruder axis stops the same amount of milliseconds earlier than the movement ends.
The time shift will possibly be acceleration and speed dependend or it's just a constant offset of ms ?
Since I'm not so familiar with implementing complex c-code into an existing firmware I wonder if someone else thought about that improvement already. Maybe it's already implemented in other firmware versions ?
Please give me your feedback about the above idea.
cu Jo..
