That sounds promising!
What filament did you try?
I just found that Sanjay from E3D did an excellent comparison on Ninjaflex, FilaFlex and "Flexible Polyester 40D Shore", it's here:
http://forums.reprap.org/read.php?1,269018
A lot of good advice on how to print these types (example use constant speed troughout the print even for the first layer).
He tested them on a Mendel 90 which if I understand correctly has the feeder mounted on the hotend so no real comparison to the Bowden/Ultimaker setup...
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turutk 0
I tried a similar filament with an UM at 220degrees 40mm/sec no retraction. The result is as flexible as the video you gave. Strings got off easily so no retraction was not a problem however I guess retraction will work as long as you print slowly. Faster prints gave me clogging in about 15 minutes.
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