Earlier quoted context omitted.
I bet you could 3D print those pads for "normal" tall chairs with the bars if you wanted to.
By "3D print" you of course mean going to a home improvement store and buying some wooden boards and metal attachment pieces. 3D printing is totally unsuitable for the task, both because of low durability of printed objects and the time it would take you to print a pad like this (a few days, probably).
I'd say that you'd be looking at 8-10 hours per print with a consumer FDM (extruded plastic) printer on the default settings.
If the printer is correctly configured it will probably be more durable than you're implying, and even if it only lasts a year you could always cheaply print more.