⬢Make sure the X-axis motor is on the left and facing up.
⬢Gently slide one bearing onto the rod further away. Do not try to slide the bearing onto the rod tilted. Do not use excessive force!
⬢Carefully slide the two other bearings onto the rod closer to you. Same here, do not use too much force and not tilt the rod vs. bearing!
⬢Place both smooth rods into the channels in the extruder x-carriage. This is to make 100% sure cables are guided correctly.
⬢Slide the X-end-idler back onto the smooth rods. You may need to use a lot of force, but yet be careful. Do not use a hammer, F clamp or a similar tool. Keep the part perpendicular to the rods during insertion.
⬢Make sure that both trapezoidal (plastic) nuts are pointing towards you.
⬢Using the right hand rotate the motor to its original position and hold it there (tension is applied to the belt).
⬢Using two fingers on your left hand push the belt together. Very little force should be needed for bending the belt, BUT the belt shouldn't be bent by its own weight before being pressed with your fingers - it must be straight.
If you are struggling to rotate the motor back into position, the belt tension is too high.
⬢Depending on the belt being under or overstretched, adjust the position of the belt in the X-carriage.
⬢When done, rotate the motor to its original position and tighten the M3 screws up again.
⬢Use the technique described below to test if the belt is stretched properly.
⬢Use pliers to hold the X-axis motor shaft.
⬢Move the extruder towards the X-axis motor. Don't use excessive force.
⬢If the belt is stretched properly, you should feel some resistance and the extruder won't move at all. If the belt is too loose, it will deform (create a "wave") and jump over the teeth on the pulley.
Belt too loose? Return to the previous step and repeat all steps until now. You have to rotate the motor and retighten the belt in the X-carriage. Shortening the belt length by moving one or two teeth outside X-carriage should be enough.
In this step, we will finish adjusting the belt tension. Please read the instructions first, your belt might have proper tension set already, then there is no need for additional screw adjustment.
⬢First, slightly release all the screws holding the motor. Otherwise, the "tensioner" won't work (the motor must be able to move).
⬢Using ball-end Allen key start tightening the screw on the rear side of the X-end-motor, but after each turn or two check the tension in the belt.
⬢For the optimal performance, the belt must feel stiff if you pinch it with your fingers. Move the extruder all the way to the X-end-idler and try the belt tension in the middle of the X-axis.
⬢When you achieve an optimal tension, please tighten the screws up again.
In case you are experiencing X-axis failures during calibration or skipped layers in the X direction, adjust this screw accordingly. Tightening the screw stretches the belt. Releasing the screw has the opposite effect. And don't forget to release the screws on the motor first :)
⬢Before you start printing, you need to calibrate the Z-axis.
⬢Remove the cloth from the heatbed.
⬢Place the steelsheet back on the heatbed.
⬢Turn the printer ON.
⬢On the printer screen navigate to Calibration -> Calibrate Z and following the instructions on the display.
⬢Great job! It was not so easy, but you have just successfully replaced the X-axis bearings!
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