jimc wrote:with the relative extrusion checked it has always worked great for me as well. im using both mac and pc version on 3 different printers all running marlin. since that feature came out in 3.0 about a year ago you are the first person i have heard post about this problem. i have seen plenty of posts about the retractions being really long which the relative distance has cured for most people but ive never heard of heavy over extrusion.
Hi, I'm posting proof that "Perform retraction during wipe movment" is broken / over-extruding even with "Relative extrusion distances" checked.
Notice in the first picture the support around the snout of the dragon is a nice clean zigzag of dots with separation from the part as per my settings; whereas in the second picture the support forms over-extruded blobs around the snout with no separation from the part. The first picture with nice support structure is with "Perform retraction during wipe movment" off; whereas the second picture with the over-extruded blobby support structure is with "Perform retraction during wipe movment" on.
I also tried SimpleScott's suggestion of setting "Tool change retraction distance" to 0 and get the same results.
Hence, as my Subject mentions "Perform retraction during wipe movement" is broken whether "Relative extrusion distances" is checked or not.
I posted my G-code tab showing that "Relative extrusion distances" was checked throughout my testing. I will make a second post with my Advanced tab settings showing "Perform retraction during wipe" turned Off (used in the successful / first dragon picture) and On (used in failed / second dragon picture) because only 3 pics per post are allowed.