Nylon would be good also. e.g. google "taulman nylon filament 3mm".
gently squeezed
Actually if you want it to deform with gentle squeezes then you need flexible pla. Here is a video explaining how to print on a UM as it is difficult due to it easily getting stuck (it's rubbery) in the bowden tube:
Skip to 0:50 in the video.
Use this mod if you want to do flexible filaments: https://www.youmagine.com/designs/ultimaker-2-straight-tube-flexible-filament-spool-holder
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Nicolinux 288
Check out this flexible filament (PLA):
http://www.formfutura.com/3mm-filaments/specialty/flexible-pla/
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