Just like the mouse trap that I've already put on here (https://www.thingiverse.com/thing:2804447 and picture two is comparison of the two sizes), I saw a video for a rat/rodent trap...
https: //youtu.be/YfaDQJVplYI (remove the space)
So, I upsized and slightly changed my Walk The Plank Mouse Trap and... this one works great as well!
Here's the checklist (I used what hardware I had on hand, obviously you can use whatever...):
1pcs each printed item
3pcs M6x35 (I just used 2, but I've got it drawn up for up to 3)
1pcs 1/2" Diameter Neodymium Magnet (You don't have to have a magnet in either design, but since it's adjustable, it gives you a lot better control for weight)
1pcs Wood Plank (length determined by the can you use)
1pcs Trash Can (check out the linked video for inspiration)