Hi everyone. I've had my Robo3D printer for about a month now. It seems to work great. Previously had a Cube3 which was horrible imho. This is my first post, so I apologize if the following question has been asked and answered already. My question is what filament gives the best mixture of flexibility and ease of use on the Robo3D R1+? I thought it would be easier to start with something besides Ninjaflex until I'm more comfortable with the machine and modifying it. I currently use PLA and ABS, but would like to branch out to something more flexible without having to modify the extruder with a tube, etc. right now. I don't have a problem with modifying temperatures and speed, and I'm looking for something to make phone cases, etc. that have some give to them. Suggestions? Thank you all for your input in advance.