Hello! My first post here. I just bought (and received) the original E3D v6 hot end. I am upgrading my Anet A8 printer with it, and making it a bowden setup. Before, when I wanted to change the filament color, I would just cut off the old filament and push it out with new one. This is now obviously out of question, as I don't want to push out and waste like half a meter of filament to get the new one in. So, I was wondering, is there some gcode which I could use to pull the filament out of the hot end programatically? I am using OctoPrint, so I could add a convenient button for it. I was thinking something along the lines of: Code: M104 S190 ;Heat up the hot end M109 S190 ;Wait for it to reach temperature G1 F1000 E-1000 ;Move filament backwards M104 S0 ;Cool the hot end While I figure that something like this could work in theory, I don't know the actual values (distance, speed) I should set, especially not to ruin the PTFE tube and/or the hot end and extruder themselves. Any help would be appreciated!