9mm Snap Cap
thingiverse
Here is a dummy round that can be used as a model or test piece. Google "9mm Snap cap" for their intended usage.
Download Model from Website
With this file you will be able to print 9mm Snap Cap 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 9mm Snap Cap.