Suggested Linear options to replace ball screw (no replies)

I setup my 3D printer with a single Ballscrew for the Z axis.

A while back, I read about a polymer system similar to a ball screw (without the ball bearing) and I am considering if I should make the upgrade. Sadly I can't seem to find the info.

If anyone knows what I am talking about I would appreciate some pros, cons and the name of that system.

Thanks