Robo3d R1 E3D Flex Filament Guide

*April 14, 2017 Update:* Apparently, the R1+ has a different feeder geometry, so it does not fit the R1+. R1 is still all good though :-).
*June 21, 2016 Update:* A few users have had problems and we're trying to figure out if its the dimensional accuracy of the printed part or if its something less fundamental. I'm going to get back to printing with flex and i'm sure the part will be updated.
*Nov 22, 2015 Update:* A user has successfully used this part using PETG with the stock hexagon hot