Ernest

the alternative is that they don’t sell replacement parts at all

maybe I’m misunderstanding, but isn’t the corresponding alternative in this case “you can use parts from any manufacturer you want”?

If you’re willing to change up the design aesthetic and have other materials lying around (e.g. dowels, rods, some kind of sheeting), you could also just print the “end caps” with slots for the main body.

This also has the advantage of being sturdier and maybe easier to print, but the design might be more involved.