UPDATE: After a few cycles of testing, the ‘chain mail’ style of panel, printed in a TPU-like material (something with high strain capacity) works extremely well! I have yet to have a projectile pass through the back wall of the trap. Very few make it passed the louvre in the main structure. The biggest source of frustration that I have with the design is the ‘ejecta’ of plastic pieces that fall out front of the box, but I suspect that using something more ductile, like PETG might have reduced this debris since it is less likely to shatter.

This BB target and trap is intended to be a modular approach to allow for tailoring the choice of ‘panels’ depending on the type of target shooting (slingshot, bb pistol, pellets, etc.)

I have only tested a handful of configurations using a CO2 cartridge powered bb pistol and a small slingshot, but I was surprised by how well the trap performed and found it quite fun! My best results were with two layers of the ‘chain mail’ panel printed in TPU. These stopped over two dozen rounds without fail!

I'd love to see other's ideas for new panel concepts to add to the mix, so please let me know what you come up with :)