My bearing block is double length, two cartridges.
The interference is starting after moving it along fast, as if rubber catches the rail and bends in introducing friction. It is a medium sized laser cutter, not much load, but i need it as "freewheeling" as possible. The gantry is moved by nema17 motor, so any interference is not good.

I have "exercised" the bearing a bit by moving it by hand, it loosened some. Torqued the retaining set screws etc. For now its good, but i just want to know what happens if i remove/cut grease seals.