Rebar/Roxor Knob/Cap

thingiverse

I've had a close call with a steel reinforcement bar during house construction, narrowly avoiding getting speared like a piece of meat on a skewer. Locals here employ plastic bottles as makeshift caps to prevent such accidents from happening in the first place. I, too, have utilized these bars in my own garden, and once found myself staring down the barrel of disaster when one almost poked me right in the peeper, prompting me to devise this clever knob/cap contraption to safeguard against such mishaps. Printed out on my trusty Prusa Mk2 i3 3D printer with ease, requiring not a single support structure to hold it all together.