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PizzaTijd's post in TPU error code Material issue was marked as the answer
Common issue on our side with TPU.
For us it's always one of 2 issues:
1 (99%): just a false positive on the flow sensor. Unfortunately the only fix for this is to disable the flow sensor, which is something that we always do at this point with TPU. Nothing is actually wrong with your material/feeder, and it'll just proceed normally throughout the entire print with the flow sensor off.
2 (1%): the feeder was hungry and started to eat away at the filament. It doesn't sound like this is your issue.
My recommendation is to just turn the flow sensor off when you're printing TPU, and if you start getting issue #2 to limit the maximum amount of retractions significantly.
Edit: while I don't know the actual cause, I suspect that it's just the material stretching/flexing in such a way during its pass through the feeder that the flow sensor doesn't detect any material movement for a while. TPU is relatively flexible, after all.
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PizzaTijd's post in Is it possible to only print an outline of a solid shape? was marked as the answer
The "Mold" feature under 'Special Modes' might be of use here (it's hidden by default in the printer settings). It'll only print walls that are directly outside of your model - allowing you to literally use it as a mold for your model. Only difference is that instead of using it to cast a part, you'll be using it to cut dough.
The default thickness on my end was 5mm, which may be a tad much for a cookie cutter, but you can just tweak that and the wall angle to whatever you need it to be.
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PizzaTijd's post in Changing extruders at a given layer was marked as the answer
-Add a support blocker block
-Go to "Per model settings"
-Set it to "Modify settings for Overlaps"
-In the drop-down menu below it, set it to "Cutting Mesh"
-In the bottom left corner, while having your "support blocker" block still selected, select your second extruder
-Scale the "support blocker" to your required size, and set it to your required X/Y/Z
That should print everything in the area you marked with your 2nd extruder.
I call it a "support blocker" because it loses that functionality if you set it like this in the per-model settings.
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PizzaTijd's post in What Are Skirts For? was marked as the answer
In my experience it just makes sure that your print head is primed; that the material is all ready to go, as it has already extruded the skirt before moving over to the print.