This dust filter will prevent the dust from blocking the hot-end. It is easy to install and it can be adapted on all the printers. You can change it without cutting the filament. For 3 or 1.75mm diameter. The last picture show you the collect of dust after 1 month !1) Cut a piece of an old sponge and water it. 2) Wrap the filament with it 3) Insert the filament into the filter. No need to cut the filament ! 4) Push on the sponge in order to insert it in the filter NB: Change the sponge every month !