I was using ferdyp's improved filament guide for a while and while very nice compared to stock I was having trouble with extruder jams at certain points in my spools. So far I've had no problems with this improved improved version. It seems to have reduced friction on the filament too, so your extruders won't have too pull as hard 8). The dual extrusion version is untested atm. Let me know how it works if you make one.