Anet A8 filament guide.

thingiverse

This is my version of a filament guide, as used on my Anet A8. The mount slot is a shaped fit for an 8mm thick panel. The modelling will ensure an easy fit and a good grip on the panel. The split front on the piece will allow filament to be slotted through. I also use a teflon tube on my filament and can easily fit through a 3mm tube. Because this is a "twist fit" the filament cannot work itself loose. A simple design that works well for me. Let me know if you like it!