Grapling hook
thingiverse
This grappling hook can also latch onto objects when dropped on them. Some sanding may be required depending on your 3D printer's specifications. Use 3 x 5 mm bolts. Update: I revised the files, adding tolerances of .2 to .3 mm to all the joints so the parts won't require any sanding at all (depending on your 3D printer).
Download Model from thingiverse
With this file you will be able to print Grapling hook with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Grapling hook.