I have my filament spool mounted above and behind the machine so the filament can be easily fed into the extruder, however there was one problem, the filament would rub against the 8mm threaded rod when the extruder head (x-axis) moved back and forth.
So I thought, why not use a left over piece of 8mm smooth bar to fix it.
And to easily mount this I needed some quick snap in brackets, so here they are!
Print out a LEFT and a RIGHT Mendel Filament Guide bracket.
Cut a piece of 8mm smooth bar to the right length (approximately 30cm) and place the brackets on the left and right hand side respectively.
The filament should run OVER the bar so put the bar between the filament and the filament spool and then hook the ends into the front top bar and snap onto the back top bar.