Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2203475.

My setup doesn't allow for me to use the back mounted filament holders. So I designed some side holders. Because the end of the filament guide tube would move closer and father away, sometimes I had an issue with filament getting off the spool and tangling or being pulled taught. I designed filament guides the keep it in place and keep the filament from getting off the spool. It has a little bucket that the filament guide tube fits into. The opening is 6.2mm and tapers down to 6mm.

Above the handle opening on the side is a screw. Unscrew this, then screw it back in with the filament guide in place. Break off the little cube supprts under the bucket arms. Insert the bucket with the top end (the model is printed unpside down) into the side holes, and let it naturally flip over. Enjoy.