Leveling Arm Replacement

This document will outline the steps necessary to replace a defective or damaged leveling assembly. This includes the leveling switch, servo motor, and mounting bracket.

1. Scissors
2. 2mm Hex Bit or Hex Wrench (Allen Key)
3. T10 Torx (Star) or Screwdriver Bit

1. Allow the build plate and nozzle to cool down below 60 degrees C before handling. To ensure this, using the touchscreen go to tools, preheat, then select pause on both nozzle temperature, and platform temperature icons. Allow the temperature to drop below 60 degrees C on both nozzle and platform. The build platform may take up to 20 minutes to cool down to a safe temperature.

1. Cut the filament just before the intake on the top of the extruder.
2. Unscrew the two screws on the top of the filament guide bracket using the 2.5 mm hex wrench.
3. Remove the top cover.
4. Carefully unplug the filament run out switch from the extruder circuit board, ensuring to pull out the plastic plug and not the wires; pulling the wires can damage the connection of the extruder.

1. Using the 2 black push pins (encircled in red) of the shielded ribbon cable, push down to release it from the circuit board.
2. Remove the connector from the circuit board and pull on the cable. Always use great care when handling a shielded circuit cable.
3. Set aside the cable within the machine, making usre there are no sharp kinks or turns produced.

a. Remove the three screws holding the servo motor bracket in place with a T10 Torx (star) bit.

b. Get a visual understanding of how the leveling arm is located and oriented in the assembly, rotate the leveling arm to vertical position (see Figure 10), and then pull the servo motor assembly vertically upwards away from the extruder.

1. Disconnect the leveling switch (black and red wires) and servo motor (red, brown, and yellow) from the extruder circuit board. When removing these, always remove by the plastic connectors. Never pull by the wires -this can damage or break the connectors.

1. Replace the leveling servo assembly carefully by maneuvering the leveling arm through the extruder chassis
2. Replace the three screws holding the servo motor chassis in place as shown in Step 4a.
3. Reconnect both wire connectors to the extruder circuit board as described in Step 5a.
4. Loop the shielded circuit cable through the plastic guide bracket. Refer to Step 3b.
5. Press the black connector pins on the shielded ribbon cables and align with the receptacle as described in Step 3b. Gently push the ribbon cable onto the receptacle and release the black pins. An audible “click"? should be heard when it is reconnected.
6. Reconnect the filament runout switch from the extruder top cover to the circuit board. Refer step 3e.
7. Replace the top cover and the three (two on top, one on bottom) screws attaching it to the extruder. NOTE: After replacing the top cover, ensure that no wires are exposed out of the extruder body. If any wires are exposed or hanging out, the extruder top cover will need to be removed and replaced.

This step will outline how to calibrate the leveling arm. The replaced leveling arm does not know where it is in rotation before calibration, so the following instructions will calibrate it to the correct position. Dremel will supply you with a USB stick that hosts the calibration firmware for the leveling arm.

1. With the printer turned off, insert the supplied USB stick into the USB port on the front of your 3D40.
2. Turn on the printer and wait for the calibration screen to appear.
3. The “level arm set: (1/2)"? will show up on the screen. The Up and Down orientations have + and - adjustment buttons. The adjusted angle can be seen in the black box between the + and – buttons.
   
   i. Press “test"? once to move the levelling arm down.
   ii. Ensure the leveling arm is vertical (straight up/down) as shown in Figure 12a. If not, press + to increase angle or – to decrease angle in front of “down"? as shown in the picture below.
   iii. Press “test"? twice to check the orientation after adjustment in vertical position. If not satisfied with the orientation of the arm, repeat step i. and ii. until desired orientation is achieved in vertical position.
   iv. Press “test"? once to move the arm in the stow position. v. Ensure the leveling arm is NOT exposed like it is shown in the picture below.
   viii. Once the angles are adjusted for both vertical and stowing positions, press “next"?.