Remove/Replace MCO Tubing Only

WARNING: FAILURE TO REPLACE Damaged tubing will risk resin spills, a degradation in part quality, and possibly failed builds.

CAUTION: RESIN SPILLS POSSIBLE. WEAR 100% NITRILE GLOVES AND EYE PROTECTION THROUGHOUT THIS PROCEDURE.

 

If your resin tube has become damaged in some way, you must replace it. This section will be very similar to a Material Changeover, but will not change out the resin cartridge.

  1. On the Controller Status screen, expand the Printer on which you wish to change the resin. On the Resin Card, tap the  button. This will disable the unit so that it will not receive any print jobs.
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  1. You will see the following screens on the Controller (a) and Printer (b):
    1. Tap the X or Close button to clear this message and free up the Controller for other Modular users.
  1. Open the lower-print-chamber door and pull the MDM toward you. There are hard stops built into the slides to keep the MDM from coming completely out.
  2. Fully tighten the white cap on the top of the cartridge.

  1. Press the Eject button to eject the cartridge. Remove the resin cartridge and place the rubber cap over the cartridge valve (Fig. 5.1 below). Once you have ejected the cartridge, notice that the screen on the Printer changes to the one below (Fig. 5.2).

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Figure 5.1
Figure 5.2

NOTE: You must remove the cartridge temporarily because the coupler at the bottom of the cartridge would interfere later in the procedure.

  1. There are different options for what to do with the resin cartridge during the procedure:
    1. If you will not use the resin cartridge again, dispose of it according to all government regulations.
    2. If you will reuse the resin cartridge right after this procedure, the procedure is short enough that you can simply store the cartridge according to the section Resin Handling and Safety until finished.

NOTE: If you are changing resin types, stop this procedure now. You should be doing a Material Changeover instead.

  1. Use a T20 screwdriver to remove the bottom two M4 screws (in red, below) on the MDM front panel. Loosen the top two M4 screws (in green, below) a full turn. The panel should now slide up and off.

  1. Place paper towels on the floor in front of the printer, just under the pulled-out MDM. The drip trays in the MDM and printer floor will catch resin drips inside the machine.

  1. In the upper build chamber, place provided cap on fill nozzle (1, below) and disconnect the tube from its holder (2, below). This will help to avoid resin spills and to preserve the tube for future use. From the front of the machine, reach under the chassis and pull the resin tube down into the lower build chamber.

  1. In the MDM, pull the ring out and to the right to release the MCO Door. Open the MCO Door.

  1. Remove two thumb screws to disconnect the Resin-Pump Cover from the Resin-Pump Motor. Remove the Resin-Pump Cover.

  1. In the bottom-left of the MDM, unclamp the resin-delivery tube, and carefully pull the tube out through the hole. Pull the rest of the tubing completely out of the MDM.

 

  1. Remove the resin label from the old tube and set it to the side. Discard the old tube according to all government regulations. It cannot be reused or repaired.
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  1. Obtain your new tubing kit. This is identical to the Material Changeover Kit. Place the resin label you removed in Step 13 onto the new tube in a position where it will not interfere with the tube fitting into any machine fixture. The image at the right demonstrates a good place to install this label.
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  1. In the bottom-left corner of the MDM, feed the Resin-Delivery Tube through the hole. Once the tube is mostly through, open the clamp, and then secure the tube by pushing in on the clip until you hear a click.

  1. With the upper-build-chamber door open, feed the Resin-Delivery Tube from the lower chamber up through the hole to the left of the elevator. With your other hand, grab the tube so that it does not fall back through the hole.
  1. Place the Resin-Delivery Tube's cap in the fixture as shown at the right. Feed the tube through the delivery fixture, ensuring that the tube does not pinch anywhere. Ensure that the tube does not protrude too far out from the fixture holding it in place. If the tube is too far out, the print platform will hit it on its way up/down.

    CAUTION: Failure to remove the red cap will result in the cap being forced off when resin pumps into the resin tray. The cap will fall into the tray and, if not noticed, will cause resin-tray breakage and build failure.

  1. Back in the MDM, install the Resin-Pump Cover on the Resin-Pump Motor. Secure it in place with the thumb screws you removed in Step 11. Tighten screws by hand until they are snug, plus one more revolution.

  1. Install Cartridge Coupler with the gray button facing toward the back of the machine. Ensure that the resin tubing below the coupler is firmly within the clamps shown below. These clamps are part of a sensor that detects resin presence in the tubing to assist the machine in certain functions.

 

  1. Close the MCO Door and secure in place by pulling the ring out and to the left.

    CAUTION: Failure to perform this step before installing a resin cartridge could damage the cartridge-chip reader.

  1. Do one of the following:
    1. If you are reusing the resin cartridge you removed in Step 5, reinstall it now. Unscrew the cartridge cap one quarter turn from snug. Skip to Step 23.
    2. If you are using a new cartridge of the same resin type that was removed in Step 5, ensure the cartridge has been premixed properly and install it now, sliding the cartridge down the chute in the orientation shown at the right. The Cartridge Key should be on the left (see below). Ensure the cartridge is fully seated by pushing down on it until you hear it click into place. Proceed to Step 22.

  1. Remove the cap from the top of the cartridge and take the following steps to ventilate the cartridge:
    1. Grab the foil seal by the pull-tab on top.
    2. Pull on the tab from the edge of the seal, as seen at the right. Peel the seal off slowly, going down the same axis as the pull tab. Pulling straight up on the tab (below, left), or pulling along the axis perpendicular to the pull tab, can make this task more difficult and can even break the tab.

  1. Recap the cartridge and tighten the cap finger-tight. Then loosen the cap by a quarter turn to allow for ventilation.

CAUTION: DO NOT FORGET TO REMOVE THE CAP AND VENT THE CARTRIDGE. THE SUCTION OF THE RESIN PUMP WILL CAUSE THE CARTRIDGE TO COLLAPSE IF IT IS NOT VENTILATED. THIS CAN CAUSE THE CARTRIDGE TO BREAK AND SPILL RESIN INSIDE THE MACHINE. THIS SITUATION WOULD REQUIRE YOU TO CEASE PRINTING AND TO HAVE A 3D SYSTEMS SERVICE CALL TO COMPLETELY CLEAN THE MACHINE.

  1. Push the MDM back until it hits its rear limit.

  1. Reinstall the MDM front plate, sliding the plate over the top two screws to guide it into place. Use a T20 screwdriver to tighten the top two screws (in green, below) and reinstall the bottom two screws (in red, below). If you did not do so in Step 17, ensure that the red cap has been removed from the resin-delivery tube above the resin tray, and close the orange printer door.

  1. On the Printer touch screen, press and hold the  button to tell the unit you have finished performing the material-changeover procedure. This will re-enable the Printer and allow it to pump resin and print.

You have successfully switched the tubing on a Printer! If you experience any issues with your new tubing, please contact 3D Systems Service.