Cura4.6.1+S5 Unneeded swap & retract @ every layer

[spacecolonyone 1]

Hi Folks, I'm working on my first print since updating to Cura 4.6.1 and have things set up as follows:

 

-UM Nylon in extruder 1 from a drybox. (Printer demands an override because the NFC didn't see the branded spool, ugh.)

-UM Tough PLA in extruder 2

-Engineering 150um, modified with 0.15 first layer, no prime tower

-Support from extruder 2 (don't really need much)

-Retract at layer change is not selected.

 

I'm printing a handful of parts, all but one of which are only a cm or so tall. Those are all finished now and it is working on the final ~90mm tall Nylon part. In the final ~ 15 mm or so it will need extruder 2 again for some supports for annular openings, until then though it is unsupported nylon all the way up. The last version of this part that is exactly what the printer did: non-stop layer after layer after layer, though this was with 4.5.0.

 

This time between each layer the S5 is slewing to the core swap, retracting the nylon, swapping to core 2, swapping to core 1, pause, feeding the nylon, adding about 17s. So far there doesn't seem to be any ill effect (aside from something like a 3h print time boost and extra wear).

 

Any ideas?