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Let's talk about TPU and the S5 (and probably other UM systems as well)


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Posted · Let's talk about TPU and the S5 (and probably other UM systems as well)
I have been conducting experiments with different TPU filaments and here is what I find. All but one are supposedly TPU95A:
 
UM: works great!
Matterhackers: Won't load properly initially and quits loading during printing
Polymaker: same as Matterhackers
NinjaTek Cheetah: works great!
NinjaTek NinjaFlex (TPU 85A): same as Matterhackers
 
You can 100% predict whether or not the filament will work based on the initial load. The filaments that fail will stop the initial load 2-3 inches away from the print head because of friction in the Bowden tube. The UM and Cheetah don't quite make it to the print head but are within an inch. I just release the clamp and push them into the print head to save time on the initial load.
 
There are times when I really do want to use softer filaments. I have played around with the feed tension and that makes no difference. Has anyone had any success with these softer filaments and if so what did you do to overcome the friction problem?
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