buttons
thingiverse
People lose buttons all the time, and it's often simpler just to sew on a new one rather than going out to find the missing piece.
Download Model from thingiverse
With this file you will be able to print buttons 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 buttons.