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Rollers squealing

Has anyone had trouble with their rollers squealing?

After cleaning them they’ve been making a squeaking noise when printing. Wondering if anyone has found a way to deal with it.

The rollers nearest and furthest from the front of the printer seem to have a little too much friction.

I think I’ve figured it out. In the roller-holder, there are four small contact points (per roller), little plastic v-shaped stubs. I took out my macro lens and had a close look at them.

I suspect this “pitting” is the source of the additional friction, causing my squealing.

thanks for the awesome information.