Hi all

I'm struggling with the linear rails I bought for my project.
How easily should the carriages move on a HGH20 rail?

My 3d printer has 12mm linear rails and the carriages fall freely when the rail is held vertically. I was expecting similar for the HGH20 rails but they just sit there. Even removing the wiper plates there is no roll although they do move with a light tap but then stop immediately. Is this normal?

As a test, I replaced the HGH20 rails with some Sbr16 rails and they work fine, even when I attach my end plates and gantry and my stepper motors easily move it all.

Have I bought the wrong rails? Am I expecting too much of them?

Thanks