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Thanks for the reply.

It is true that you can retract the extruder to remove the filament. The problem is that if you retract using marlin through the lcd, the speed is really slow. There probably is a way to make it fast but I haven't looked into it. I usually connect my computer and use repetier but that involves connecting a computer.

What I wanted was a little lever on the side of the idler that let's you lift it up the bearing while compressing the spring and you can easily change the filament by hand. Just like the in the remix that I linked.
I will see if I can make something like that using my limited knowledge of openScad.