Add to Cart Extruder Carriage Linear Bearing - 4 Pack - R2, C2 | THK THK Regular Price: Now: $19.95 Regular Price: Linear Bearing Upgrade Precision linear bearings. These are the bearings that go inside the extruder carriage block and ride on the 6mm linear rods of the Robo r2 and C2. Includes LM6LUU... Regular Price: Now: $19.95 Regular Price: Add to Cart