Step 1: Remove the lower rear panel screws

The six black lower rear panel screws are circled in red. The four chrome lower rear panel grounding screws are circled in blue.

Using a 2.5 mm hex driver, remove the six black panel screws and the four chrome panel grounding screws securing the lower rear panel to the printer. Set the screws aside, taking care to separate the black and chrome screws for later reinstallation.

Step 2: Remove the lower rear panel from the printer

Pull the lower rear panel straight back and away from the printer. Lay it down on a flat, clean surface.

Step 3: Locate the exhaust duct and ring clamp

Locate the ring clamp attached to the exhaust duct in the center of the printer.

Step 4: Loosen the ring clamp screw

Using a 6.5 mm flathead screwdriver, loosen the ring clamp screw. Do not remove the screw. Pull the exhaust duct away from the exhaust pipe.

Step 5: Locate the exhaust inlet

Open the filter cabinet door on the printer. Locate the exhaust inlet on the right side of the cabinet.

Step 6: Remove the exhaust inlet screws

Using a 2.0 mm hex driver, remove the four screws attaching the exhaust inlet to the filter cabinet. Set the screws aside.

Step 7: Remove the upper rear panel screws

The two black upper rear panel screws are circled in red. The two chrome upper rear panel grounding screws are circled in blue.

Using a 2.5 mm hex driver, remove the two black panel screws and two chrome panel grounding screws securing the upper rear panel to the printer. Set the screws aside, taking care to separate the black and chrome screws for later reinstallation.

Step 1: Disconnect the air intake tube

Locate the ball valve, positioned at the back of the printer. Using a slotted screwdriver, loosen the ring clamp on the bottom of the valve and disconnect the air intake tube.

Step 2: Disconnect the ball valve from the nitrogen controller board

Disconnect the ball valve cable from plug labeled J088 on the nitrogen controller board below it.

Step 3: Unmount the nitrogen plenum

The nitrogen ball valve is attached to the bottom of the nitrogen plenum. Using a T20 Torx driver and a 2.5 mm hex driver, remove the three T20 Torx screws (on top) and two M3 socket head screws and washers (on the hopper-side) that secure the nitrogen plenum to the printer. Set the screws aside.

Step 4: Disconnect the tubing from the nitrogen plenum

Using a slotted screwdriver, loosen the two ring clamps on the nitrogen plenum and disconnect the aluminum tubes. On newer printers, there will be a white rubber gasket underneath the tube at the top of the plenum. This can remain in place. Disconnect the silicone pressure tap tube.

Step 5: Disconnect the remaining tubing

Locate the brass elbow fitting towards the rear hopper side of the printer, next to the ball valve. Push the brass ring down while pulling on the plastic tube to disconnect it.

Step 6: Uninstall the nitrogen plenum and ball valve

Remove the plenum assembly from the printer and set it down on a flat surface.

Step 7: Separate the ball valve from the nitrogen plenum

Either by hand or with an adjustable wrench, unscrew the nitrogen ball valve from the rest of the assembly as shown.

Step 1: Prepare the new ball valve

If the replacement nitrogen ball valve does not come with the plastic barb fitting and the brass straight fitting pre-installed, apply one to two turns of thread seal tape to the threads in a clockwise motion, then use an adjustable wrench to secure the fittings to the valve as shown.

Apply one or two turns of thread seal tape to the remaining threads of the brass straight fitting, if it has not been preapplied.

Step 3: Mount the ball valve to the nitrogen plenum

Either by hand or with an adjustable wrench, screw the new nitrogen ball valve into the plenum assembly until it is fully screwed in and the gearbox is in the orientation shown.

Step 4: Mount and secure the nitrogen plenum and ball valve

Reinstall the plenum assembly with the new valve onto the top rear of the printer. Thread the mounting screws (three T20 Torx screws and two M3 socket head screws with washers) into the screw holes as shown. Using a T20 Torx driver and a 2.5 mm hex driver, tighten the screws until snug.

Step 5: Reconnect the tubes to the nitrogen plenum

Reattach the silicone pressure tap tube to the nitrogen plenum. Reinstall the aluminum tubes and, using a slotted screwdriver, tighten the ring clamps until they are secure.

Step 6: Reconnect the remaining tube

Locate the brass elbow fitting towards the rear hopper side of the printer, next to the ball valve. Push the plastic tube firmly into the fitting. After insertion, pull on the tube gently to ensure it does not come out.

Step 7: Reconnect the ball valve cable to the nitrogen controller board

Reconnect the ball valve cable to the plug labeled J088 on the nitrogen controller board.

Step 8: Reconnect the air intake tube to the nitrogen ball valve

Reattach the air intake tube to the bottom of the ball valve. Using a slotted screwdriver, tighten the ring clamp until secure.

Step 1: Align the upper rear panel with the printer

Lift the upper rear panel and align it with the four screw holes on the top of the printer.

Step 2: Secure the upper rear panel top screws

Thread the four 6.0 mm screws into each of the screw holes on the top of the printer. Using a 2.5 mm hex driver, tighten the screws until finger tight. You may need to adjust the exhaust duct to correctly position the upper rear panel.

Step 3: Secure the buffer side panel screws

Thread the two 6 mm screws into the screw holes on the buffer side and the two 6 mm screws into the screw holes on the hopper side. Using a 2.5 mm hex driver, tighten the screws until snug.

Step 4: Secure the hopper side panel screws

Thread the two 6mm screws into the holes on the hopper side. Using a 2.5 mm hex driver, tighten the screws until snug.

Step 5: Secure the upper rear panel grounding screws

The two black upper rear panel screws are circled in red. The two chrome upper rear panel grounding screws are circled in blue.

Thread the panel screws into the indicated screw holes on the upper rear panel. Refer to the image for the correct locations of the black and chrome screws. Using a 2.5 mm hex driver, screw in the two black panel screws and two chrome grounding screws securing the upper rear panel to the printer.

Step 8: Secure the exhaust inlet screws

Open the filter cabinet door on the printer. Thread the four 8.0 mm screws into the screw holes. Using a 2.0 mm hex driver, screw in the four exhaust duct screws until finger tight.

Step 9: Check the exhaust duct seal

To ensure there is no gap between the exhaust duct’s mounting plate and the filter cabinet housing, shine a flashlight or other light source around the exhaust inlet inside the filter cabinet. If any light is visible behind the filter cabinet, the duct is not properly sealed. If necessary, use a 2.0 mm hex driver to tighten the exhaust duct screws. Close the filter cabinet door when finished.

Step 10: Secure the lower rear panel grounding screws

The six black lower rear panel screws are circled in red. The four chrome lower rear panel grounding screws are circled in blue.

Thread the panel screws into the indicated screw holes on the lower rear panel. Refer to the image for the correct locations of the black and chrome screws. Using a 2.5 mm hex driver, screw in the six black panel screws and four chrome panel grounding screws securing the lower rear panel to the printer.

Step 3: Enable the nitrogen system

Tap the printer icon in the left sidebar to access the printer status screen. Toggle Nitrogen System to ON. Confirm that the touchscreen shows N₂ Mode and that both the Inlet Pressure and the Valve Pressure are in range.