This is a replacement for the rubber feet or plugs that fit into cut tube or piping.
These are used as chair feet, or for any thing that has cut metal tubing, which needs a cover.
This is for the transom ladder on my boat.
Edit the OpenSCAD Source to specify the diameter of tubing, currently set to 25mm. Export STL, or use attached STL. Generate gcodes from STL and print.
It would probably benefit from being printed in soft PLA. For outdoor use, ABS might be sensible.