Purge Line Variation  

Purge Line Variation

Since new, my Mk3 has occasionally printed a purge line about twice as long as other times. I've never been concerned. Prints continue and finish as expected. The symptom is the purge rate doesn't change along the length, as if the second step doesn't change the E rate as it should, rather, it simply extrudes volume over a longer length. I believe it is an absolute vs relative move issue. The printer sometimes hiccups.

G1 Y-3.0 F1000.0 ; go outside print area
G92 E0.0
G1 X60.0 E9.0 F1000.0 ; intro line
M73 Q0 S126
M73 P0 R125
G1 X100.0 E12.5 F1000.0 ; intro line
G92 E0.0
M221 S95

G1 Y-3.0 F1000.0 ; go outside print area
G92 E0.0
G1 X60.0 E9.0 F1000.0 ; intro line
M73 Q0 S2723
M73 P0 R2682
G1 X100.0 E12.5 F1000.0 ; intro line
G92 E0.0
M221 S95

I did post at GitHub ... it looks like a firmware error. That said, I found my 100% issue was a typo on my part ... but in my research found that Slic3r randomly inserts additional code in segments that are customer gcode. The M73 commands are an example of that random occurrence: they aren't even in the custom gcode that does the purge. Since the random placement of other code on top of custom code may impact the printer operation, it could also be a Slic3r issue.