HaLo2FrEeEk

Here's my two cents. I've actually tried modifying the script to alleviate this issue. Say I set a filament change for layer 10. What I experience is, after printing layer 9, the filament retracts according to my retraction distance setting, then the head moves to the corner and the filament pulls all the way out. I put in the new filament and let it purge, continue and pull off the purge right before printing starts again and...blob. Why? Remember the retract at the end of layer 9? The printer thinks the filament is still 8mm up the nozzle, so it tries to move it back, but after the purge the filament is already at the tip. My simple solution was to edit the gcode, find the first G0 after the M600 filament change, should be something similar to G0 F1500 E# where the # is the *absolute* position of the extruder. Change the G0 to a G92 and remove the F parameter so you're left with G92 E#. That will reset your extruder position without actually moving the filament and voila, no blob. What I'd like to know is how to access these values (absolute extruder position) from within a script. If I can do that I can modify the filament change plugin to automatically make that change. I hope this helps, and I hope someone can point me in the direction of some help with the python scripts.