Ice Trap

thingiverse

This ingenious device utilizes an ice lock mechanism that enables users to push a string, chain, or rope into one of its openings and then drop ice into the top. When positioned correctly, the string is securely fastened in place until the ice melts, rendering it nearly impossible to pull away. Its primary advantage lies in the fact that no prep work is required, simply a piece of ice can be used to activate this clever device.