Aligning the print head

After placing the print head into the frame, you have to make sure that the print head shafts are exactly 90º. To correctly align the shafts, use the calibration sticks and perform the actions described below.

Parts needed

Motors

1. First, tighten the two pulleys attached to the short belts of the X and Y motor. Push the pulley towards the frame and use the 2 mm hex key to tighten the set screw.
2. Tension the short belts by firmly pushing the motor downwards and tighten the four M3x25 bolts on each motor.

Note: Check if the two short belts are equally tight.

X axles

1. Position the pulleys on the X axles so that the long left and right timing belts are positioned in a straight line above the Y axles.
2. Place the two calibration sticks on each side of the back X axle.
3. Move the print head towards the back until the set screw of the left pulley (connected to the long left timing belt) is visible and place the X print head shaft into the calibration sticks.

   Note: Make sure the calibration sticks use the same notch.

4. Tighten the set screw of the left pulley with the 2 mm hex key.
5. If needed, move the print head slightly backwards or forwards until the set screw of the right pulley (connected to the long right timing belt) is visible.
6. Tighten the set screw of the right pulley with the 2 mm hex key.
7. Check if the pulleys on the front X axle are still in the correct position and tighten the set screws with the 2 mm hex key.

Y axles

1. Position the pulleys on the Y axles so that the long front and back timing belts are positioned in a straight line above the X axles.
2. Place the two calibration sticks on each side of the right Y axle.
3. Move the print head towards the right until the set screw of the back pulley (connected to the long back timing belt) is visible and place the Y print head shaft into the calibration sticks.

   Note: Make sure the calibration sticks use the same notch.

4. Tighten the set screw of the back pulley with the 2 mm hex key.
5. If needed, move the print head slightly to the left or right until the set screw of the front pulley (connected to the long front timing belt) is visible.
6. Tighten the set screw of the front pulley with the 2 mm hex key.
7. Check if the pulleys on the left Y axle are still in the correct position and tighten the set screws with the hex key.

Check if the head moves smoothly. Move the print head diagonally through the printer, you should not feel any resistance. If you do, the print head is probably not calibrated correctly. If necessary, repeat the steps above.