Auto Release Carabiner

This very handy carabiner allows you to lower something down on a rope, have it automatically release when the item is on the ground, then retrieve your rope & carabiner. 

This is a 3D printed version of the original metal item published in Instructables: https://www.instructables.com/Gear-Harness-Carabiner-Auto-Release/ by Mrballeng. Instruction on how to use it are in that Instructable. 

I have left off the clip, since this can only be used for relatively lightweight items, and seems to work well without it.