The rails are solid metal. The 3D Printer I have is the Anycubic Vyper and it runs like a dream.

The cable chain was super cheap on amazon so I just went that route with those.https://www.amazon.com/dp/B07WDVJB8W/ref=cm_sw_r_tw_dp_FK3W88DGNMSW3NG000KQ

But, since you mentioned it. You could print them as well.https://www.thingiverse.com/thing:2920060