Press Mounted Wad Punch
thingiverse
The title pretty much says it all. Its a wad punch/cutter that you mount on your reloading press. Its a far better way to do so than hammering or drilling them. You could probably cut card wads with a 3D printed version of this but I wouldn't try anything stronger than that. I've thrown in my fusion 360 files so you can change the wad diameter as you like.
Download Model from thingiverse
With this file you will be able to print Press Mounted Wad Punch 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 Press Mounted Wad Punch.