Threaded Plugs
thingiverse
Here are some Threaded Plugs, that I some times need. Test them out.
Download Model from thingiverse
With this file you will be able to print Threaded Plugs 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 Threaded Plugs.