filament cleaner
thingiverse
You're looking at a basic filament cleaner that you can repair by unscrewing it, and it should function perfectly with both 3mm and 1.75mm filaments. Have fun!
Download Model from thingiverse
With this file you will be able to print filament cleaner with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on filament cleaner.