Have cooling set to 0 on Layer 1.
Also have set max cooling of 40% for layer times <15secs.
Seems odd that in the Gcode there's a "M106 S102" (to set cooling to 40%) BEFORE the start script.
That means the parts fan is running at 40% whilst the hotend is trying to heat up. Not cool. Or rather, too cool.
On top of that, since the fan has explicitly been set to 0 for layer 1 (important for probably any filament, not least ABS), well the 15sec rule should probably not over-ride that either, and kick in on Layer 2 instead. But either way we don't want the parts fan before the start script!
(gcode attached + factory file... it's the last process in the list Kliipper ABS test)