i3 mega pressure release

you can use this device to release the pressure of the gear wheel that presses against the filament, to easily remove or insert a filament.
You also need:
M5 x 40 mm screw
M5 nut

Here is a link to the video explanation:
https://www.youtube.com/watch?v=wUBU59yxFQw&feature=youtu.be

enjoy.