Knockout Target

Circular target using magnets to help hold the bits in place so they can be knocked out. If you want to skip the magnets and buy the model let me know and I can send you a file with the magnet holes that uses a bit more friction to keep them in place. 

Ring is printed separate from the knock out bits.

Print settings can be whatever you desire but I strongly suggest making sure the ring is 3-5 walls and 3-5 top and bottom layers are least in case it drops.

Using 5mm magnets you can get from amazon (not very expensive).