NinjaFlex or Bendlay on new extruder

HI I've got a ROBO3D R1 model with the newer hexagon all metal extruder. I'd like to print NinjaFlex or possibly BendLay on it really soon. i have printed PLA, ColorFabb and T-Glasse with varying degrees of success, mostly getting poor results at first then excellent later on so i'm still a newbie but somewhat seasoned at this. I have printed about 4kG of filament.

I want to help impoverished people who do not have access to clean water by designing and printing these objects that convert 2-liter bottles into solar water purifiers. Here is the Thingiverse link to my first design:

http://www.thingiverse.com/thing:464463

So if you take a look at that you'll get the general idea. At any rate, what are your recommendations for printing with NinjaFlex on the all-metal hexagon extruder or should i just go with the easier BendLay material?

Les

 

well I ordered the NinjaFlex in water color so as to let the most light through. I plan to revise the design and look at a few different ones.