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  1. If you haven't check the Z axis parts during the preflight check then you should do it now or you might have problem during this chapter.
    • If you haven't check the Z axis parts during the preflight check then you should do it now or you might have problem during this chapter.

    • Note that in this chapter you will see images of MK3(S) Y carriage but all steps are exactly the same for MK2(S) and MK2.5(S).

  2. Insert 2x M5x10 screws in the z_motor_mount. Engage 2x t-nuts on the M5 screws (1-2 turns) and place them vertically.
    • Insert 2x M5x10 screws in the z_motor_mount.

    • Engage 2x t-nuts on the M5 screws (1-2 turns) and place them vertically.

    • Repeat with the remaining z_motor_mount.

  3. Make sure this section is clean of dust, it will be used as reference for the z_motor_mounts. Slide the z_motor_mount from the top of the frame. Note the orientation, the hole for the Z smooth rods should face outside the frame
    • Make sure this section is clean of dust, it will be used as reference for the z_motor_mounts.

    • Slide the z_motor_mount from the top of the frame. Note the orientation, the hole for the Z smooth rods should face outside the frame

    • Check the orientation of your z_motor_mount or it will make the next steps impossible.

    • This step and the following ones are showing a MK3(S) Y carriage but the position is the same with MK2(S) and MK2.5(S).

  4. Slide the Z motors in the z_motor_mounts. The motor cable should be oriented inside the frame (red lines on the images). Secure the Z steppers in place with 8x M3x10 screws (reused from your original Prusa). Press the motor in the direction of the yellow arrows while tightening incrementally the screws.
    • Slide the Z motors in the z_motor_mounts. The motor cable should be oriented inside the frame (red lines on the images).

    • Secure the Z steppers in place with 8x M3x10 screws (reused from your original Prusa). Press the motor in the direction of the yellow arrows while tightening incrementally the screws.

    • Check the orientation of your motor cables.

Grégoire Saunier

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