thUmb chucks
thingiverse
Humans can create impressive thumb chuck variations by adding a capital "U" and securing them with shoelaces. For more advanced techniques, visit https://www.youtube.com/results?search_query=thumb+chuck+tricks to learn some incredible tricks.
Download Model from thingiverse
With this file you will be able to print thUmb chucks 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 thUmb chucks.