Filament Guide for CR10-S in enclosure

I've made an enclosure for my CR10-S, the problem that i've encountered was underextrusion because of the extra friction that came with it. The filament is sitting on a stand on top of the enclosure, so the filament is entering straight down through the roof to the filament runout sensor. When it arrives at the sensor it had to make a sharp 90° turn to go the extruder. This created an incredible amount of fricton that led to underextrusion. It might be advised to make a spool mount that holds th