Flapper
thingiverse
This was made to fit certain belt style coolant tank skimmers. It is stronger and actually wide enough to cover the entire belt of the skimmer, unlike the provided plastic pieces. I printed them out of PETG+ and have been running them on 8 CNC mills for quite a while now, they do a much better job then the provided flappers.
Download Model from thingiverse
With this file you will be able to print Flapper 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 Flapper.