I would try Gates, they have probably the largest assortment of high pressure hoses available.
Be sure to make the bottom of the slot a half circle, to reduce stress.
I think this could be what you're looking for:
Look at no. P035
Or 2 rollers, one from each side. What kind of activation are you thinking of?
Have you tried exporting to STL instead?
Have you looked at the Linak LA36?
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