Thumb nuts!
thingiverse
Here are two variants of thumb nuts, one chunky and one slim. These are made primarily for M6 nuts which have 10mm hex sizes, however due to the magic of ~simple mathematics~ you can easily scale these for use with other nuts and bolts! Cheat sheet: M2 - 40% M3 - 55% M4 - 70% M5 - 80% M6 - 100% M7 - 110% M8 - 130% M10 - 160%
Download Model from thingiverse
With this file you will be able to print Thumb nuts! 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 nuts!.