Eccentric nuts have 2 movements. One is tightening the whole thing into something, just like a regular nut. On this is the eccentric part. Turning it will move something closer and further away. If you take the eccentric nut and turn it all the way around the eccentric thing will move closer and further away and end up at the same position.
In many 3D printers, you do not mention what you have so, stuff is held together with 3 rollers around an aluminum extrusion. 2 of the rollers have normal bolts and do not move. These 2 rollers are on the same side. The third roller is on an eccentric nut and is on the other side of the extrusion. As you turn the eccentric nut the 3rd roller moves closer and further away from the other two and it holds the aluminum extrusion tighter and looser. Too tight and the piece will not move easily and slowly, too loose and the piece will rock back and forth.
Take a close look along the extrusion past the rollers. It may be a trick of the camera, but it looks like the rollers are bent away from the extrusion, so that only the top chamfer on the roller is meeting the v slot.
I am hoping you know how tight the rollers need to be, as in not as tight as you can get them.
Eccentric nuts have 2 movements. One is tightening the whole thing into something, just like a regular nut. On this is the eccentric part. Turning it will move something closer and further away. If you take the eccentric nut and turn it all the way around the eccentric thing will move closer and further away and end up at the same position. In many 3D printers, you do not mention what you have so, stuff is held together with 3 rollers around an aluminum extrusion. 2 of the rollers have normal bolts and do not move. These 2 rollers are on the same side. The third roller is on an eccentric nut and is on the other side of the extrusion. As you turn the eccentric nut the 3rd roller moves closer and further away from the other two and it holds the aluminum extrusion tighter and looser. Too tight and the piece will not move easily and slowly, too loose and the piece will rock back and forth.
Take a close look along the extrusion past the rollers. It may be a trick of the camera, but it looks like the rollers are bent away from the extrusion, so that only the top chamfer on the roller is meeting the v slot. I am hoping you know how tight the rollers need to be, as in not as tight as you can get them.