The original covers for my staircase broke over the years, so that you'd only see the dark inside of the pipes, which was not to my liking. They also were considerable bumping hazards for tall people. 

So i designed pipe covers and made them parametric, so that you can customize them to fit your pipes.  The standard size is 80mm inner diameter with 6mm steel thickness. There also is a 1mm by 5mm chamfer to make them fit more snugly.

They are very easy to easy to print if your printer is generally abled to print TPU. I used the Generic TPU print profile with 0.28mm of layer height in Bambu Studio. You can print up to 6 80mm covers on the standard bambu build plate.