A sand flap (printable)

https://www.youtube.com/watch?v=uxLgvJQgyjQ

I saw a video about a simple DIY sand flap. I had no Idea what a sand flap was or how well it works but I decided to try to design my own and give it a try. It works surprisingly well and will certainly be used in the workings of my Filamolder 3d printer.