Version 3 of the M3D filament guide. I wanted to see if the purely vertical version or an angled version worked better, but then had some minor issues with the filament not sliding smoothly through the opening. Not wanting to give up on the idea, I took another few passes and came up with this. A simple side hook filament guide for the M3D micro printer. If you are using the M3D initial spool (from the M3D download section), this will reduce the drag of the filament over the side of the chassis and the spool holder hook. The opening for the filament in the guide is designed to allow the filament to enter and exit the filament guide at a range of angles. This should reduce the amount of friction and all for smoother delivery of filament to the extruder. UPDATE: I am working on an updated version based on the feedback from a few helpful users. The next version should be able slide more smoothly along the frame rails as well as have a small change to the filament pathway. Thanks to tadd85 and FireFox_Gaming for their feedback.I took some measurements with some digital calipers and a few tries later had the general shape for the M3D chassis hook. Since I didn't like the way the filament was riding along the side of the chassis with the default spool holder, I made the vertical version, a simple angled version, and now this one. I modified the opening to make sure that the filament would be able to slide through a little easier (without filing) from multiple angles. I hope you find one of them useful.