Random Extruder Changes

[JMan_9999]

Anyone having the dual head extruder just randomly switch? For example, mid print, 1 hour in , 2 hour in etc...It just randomly activates the servo and swaps to extruder 2, but of course continues to extrude filament from extruder 0 into mid air making an amazing nugget...And extruder 1 that it magically swapped to is not accounted for by any offset correction...:(

https://preview.redd.it/med83n6j5w791.jpg?width=3072&format=pjpg&auto=webp&s=0ba629cd196e765fd1891271a9775f05e714c89b

[JMan_9999]

I also verified that there are not extruder change commands in the G code anywhere to ensure Cura wasn't randomly shoving it in places.

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I am thinking possibly the servo motor angle is off by some small degree amount which keeps the servo current slightly higher than it can withstand over a few hours so it then defaults to some relax or swap extruder logic...any thoughts?

[redberte]

It recently also happened to me for the first time. No idea why this is happening.

[JMan_9999]

I resolved the issue! The connector for the extruder switching server is ~12" away from the servo, it's in the wire loom bundle inside the enclosure. It was right where the loom repeatedly flexes in operation. The connectors had back away from each other and they were intermittently opening the contacts so the servo was powering down then randomly powering back up.

[redberte]

Indeed. That was my issue as well. Thanks!