** Important Note **
When working on this I discovered my spool of NinjaFlex was quite a bit out of spec. You MUST check yours and set the value in the filament profile should you decide to use this. Unless, of course, by some remote chance your filament is equally out of spec :)
** Possibly less important note **
I installed a part by @Kaaaaaaaaaaaa_222966 prior to testing TPU to minimize the possibility of this filament wrapping around the extruder gear. Since this was the first time my XL has seen TPU I have no idea if it mattered or not. What I can tell you is the part fits well and I had no filament jams while testing.
https://www.printables.com/model/741152-xl-nextruder-main-plate-and-idler-lever-for-flex-f/
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After 10+ small cubes and one Benchy I arrived at these settings; YMMV.
Certainly not perfect but considering how flexible this stuff is, I'll take it.
Hoping it works for you too.
Make sure your filament is dry. :)
The author marked this model as their own original creation.