This take on the one bar prison uses 3D printed parts to give adjustability and variety of the insertables.
Enjoying the idea of how precarious and simple the one bar prisons are, I made one with the goal in mind of reducing the amount of metal working required.
The only metal working is cutting tube to size and drilling/taping one hole in aluminum for the pipe stop.
The adapter collar at the top of the larger pipe shown above has an inner tongue to prevent marring of the smaller diameter pipe. I did not have high expectations for this piece and it did fail.
Once I can come up with an easy to implement solution for this problem I will provide the finished files on thingiverse.
Discuss this on the kinky makers discord at https://discord.gg/DJRCB2t