filet
thingiverse
I have been working on 3D printing a steam (OK, It will run on air) engine and I found that I was in want of a concave filet so I decided to write a few modules to create some.
Download Model from thingiverse
With this file you will be able to print filet 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 filet.