This tool fits the locking turnbuttons that hold the PSU in place at the very back of the Original Prusa Enclosure. It allows them to be locked and unlocked without damage, and makes it easier to access them by providing some extra length. Please note: you will still have to secure the PSU, or find an extra set of hands, to keep it from falling when the locks are unlocked.
The author hasn't provided the model origin yet.