Parametric Thumb Nuts
thingiverse
While building a Wade's Extruder, I desired thumb nuts on the screws, so I created custom ones. Here are some typical measurements for various sizes: M4 (diameter 7, depth 4) and M3 (diameter 5.5, depth 3). If you need a snug fit, use the interference value. Super glue can secure the cap to the screw even with slight wiggle.
Download Model from thingiverse
With this file you will be able to print Parametric 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 Parametric Thumb Nuts.