I printed this hanger for my wall. You can also print two of them and two connectors to leave it on a shelf without hanging.
I use the 608-2RS Ball Bearings on each side with a 120 mm long rod from the MMU kit. The ball bearing is 8 mm inner diameter if you wanted to print a rod one for it. Or you could get one from amazon that would work, smaller than 8mm so it would be a little loose on the ball bearing.
https://www.amazon.com/gp/product/B07TWZ7X38/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
https://www.amazon.com/Stainless-Steel-120mm-Solid-Crafts/dp/B0CC8TG8MP/ref=sr_1_15?crid=2277X5H2X5EW7&dib=eyJ2IjoiMSJ9.IoCvOMvUfqbyHRPyDsktojveS0fjtI29jphdiCMkfs0s_B4QV-_C7osrfjhwzAxsrWSemwRFHFA4p2JXUQROELIqADVP2gwsDKmxNJAhj3zsOBtpi2WqflPiyScWY3c5iEof7ge2j_-9MqR3UN-_L4kOJKYni3Gr91wpoNvWq4pwOXGfXIcKzAufuYtY9CQJpFUAxrpXlNBE-YowZtEWxAFFikUcj9xfgW4WaHh6vdMcEpsNnYXT0GGd9_hSR_SMAHqsV6KRowzMp6xqWCfPUoCo2Fu9TAeJeKxXAHx6Z1I.hGKH89fL_mldQPtaRISQskDLUX9xFhPFVmL-zJQ8WqQ&dib_tag=se&keywords=120mm%2Brod&qid=1725723371&s=industrial&sprefix=120mm%2Brod%2Cindustrial%2C122&sr=1-15&th=1
The author marked this model as their own original creation.