Okay.
How do you make the wipe pillar build first, before the part starts?
Gcode draws a perimeter/supports with Extruder/material 1, then the part starts to draw before the wipe area.
(eventually/haven't got the feed working after the extruder swap yet...)
expected:

PLEASE TAKE A LOOK AT MY CODE ATTEMPT HERE:
I put the extruder prime/feed G1 E160 here:

is that wrong?
feed for #2ext isn't making the initial G1 E160 on first swap, then once #2ext/material filament eventually feeds() the retract/feed exchanges work fine.
Printer gcode:

I'm sure it's right in front of me... don't know how things work in there yet...
Help please?