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Hi bilalasd. I'm not quite sure what you mean with "easily switch filament". For switching filament there exist two methods.
I usually let the extruder run backwards by the length of the bowden tube, enter the new filament and extrude by the length of the tube. All work is done by the stepper, you don't even need to release the idler screw. Easy as pie.
If you like to change the filament by hand, all you need to do is releasing the idler screw. The filament can be removed by pulling it out. Due to the funnel like design the new filament enters the bowden tube by itself. Just slide it in and tighten the idler screw afterwards.