Mousetrap for PET bottle

Based on [ripper121's mousetrap](https://www.thingiverse.com/thing:3070230), which I had previously used with success. As good as that one was, there were some changes I wanted to make, so I redesigned it from scratch.

I made it all print at once. No assembly required. This is optional, as I've also included separate files for the ball and the trap. You can print the ball first and put it into the trap while printing if you prefer. I also made a version with small connections between the