This is a filament dust remover in cylindrical form. It can be attached anywhere on the filament. On top of the extruder or before your filament guide, etc.1.) download 2.) print 3.) put a sponge in it 4.) clip your filament in like shown in the pictures 5.) like it :)If you wish to change the size: Download scad-file and change the variables for "tube_r" and "tube_height".