BATMAN'S GRAPPLING HOOK INSPIRED
It's my own design, inspired by batmans grappling hook gun (but without a gun, to throw). It has a small hole for a rope at the bottom, so you can throw it with the rope like a real hook.
Feel free to remix with attribution, sell at school (but don't sell the file on other platforms).
I used 4 walls, 2mm layer height and 45% Infill and with PLA Filament. But you could also try it with PETG and tell others in the comments if that makes it more durable or not!
I am not sure if it's extremely durable, so you probably shouldn't climb on it.
But it definetely can hold some wheight.
Have Fun!