Filament sensor
thingiverse
I've inserted the arrow into the diagram to clearly show the path the filament will take as it's fed through the machine.
Download Model from thingiverse
With this file you will be able to print Filament sensor with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Filament sensor.