Why stress your filament by making it bend almost 90 degrees when feeding it from below, print and install my 'RL Filament Spool Holder' with it's crossbar or optional rod holders.
Fits snugly on the RL's aluminium frame and feeds the filament down into the extruder from above. Takes both the large 200mm dia spools and the smaller chunkier 160mm dia spools.
http://www.thingiverse.com/thing:857329
IMG_20150531_103001.jpg