An Ice Lock for Selfbondage purposes - fix in a high place and put a key on the moveable end(key.stl).
Filled up it will last ~2h40m. Fill it up with Water and put it in the freezer for ~3h but dont fill it to the brim, due to the water expansion when it freezes.
(this is an old model i used to have on Thingiverse)
!ATTENTION: Selfbondage can be quite dangerous- always have a backup Plan!!!!!
The author hasn't provided the model origin yet.