Over time, the inner gasket or volcano seal on the build chamber may degrade. To inspect the inner gasket, gently pull back on the black external frame gasket where it meets the build chamber lip. If the inner gasket exhibits cracks or discoloration, it should be replaced.

Use this guide to replace the build chamber’s inner gasket.

Overview: Prepare the build chamber and a dust-free workspace for cleaning and replacing the Fuse 1 generation build chamber inner gasket.

Step 1: Empty the build chamber

If the build chamber has recently been used for a print and contains a powder cake, empty the build chamber using a Fuse Sift.

Step 2: Raise the print bed

Even if the build chamber is already empty, fully raise the print bed using the controls on the Fuse Sift or by tapping Settings > System > Motor Moves on the printer touchscreen. It is normal for powder to fall out from the bottom of the build chamber and accumulate on the work surface when removing the print bed.

Step 3: Vacuum the build chamber

Use the vacuum attached to the Fuse Sift to clean the build chamber. If the build chamber is inserted into the Fuse Sift, push the Vac button on the control panel or tap the vacuum hose icon on the touchscreen to turn the vacuum on.

Vacuum the print bed and the top of the build chamber to remove any loose powder and prevent contamination of the new print bed or your workspace. If the build chamber is not currently inserted into the Fuse Sift, remove the vacuum hose from the port on the side of the Fuse Sift so that it can reach the build chamber, then turn on the vacuum.

Step 4: Prepare the workspace

Clear a workspace around your build chamber. Ensure that the workspace is well-ventilated and free of dust.

Overview: Remove the build chamber’s top cover to access and remove the inner gasket.

Step 1: Remove the top cover screws

Using a 2 mm hex driver, loosen and remove the 10 M3 × 5 mm screws securing the build chamber’s top cover to the build chamber’s body. Set the screws aside.

Step 4: Separate the inner gasket from the build chamber

Peel the inner gasket away from the build chamber.

Overview: Install the replacement inner gasket.

Step 1: Inspect the replacement inner gasket

Inspect the replacement inner gasket for any contamination or debris. Use a clean paper towel to wipe it clean.

Step 2: Place the replacement inner gasket on the build chamber surface

Place the replacement inner gasket on the machined build chamber surface. Take care to orient the print bed correctly. The inner gasket only fits over all standoffs and holes in one orientation.

Make your way around the gasket, stretching it into place over the inner wall of the build chamber.

Step 3: Inspect the inner gasket fit and position

Correct inner gasket position

Incorrect inner gasket position

Inspect all surfaces of the seal and ensure the following:

• The seal is flush along all edges.
• The top part of the seal is positioned in the groove in the build chamber.
• The seal is properly located around all standoffs.

Note that while the gasket shown here may be a different color than your build chamber's original gasket or the replacement, the inspection criteria are the same.

Overview: After replacing the build chamber inner gasket, clean the build chamber and perform final checks.

Step 1: Clean the build chamber and work surface

Clean the build chamber and work space of any powder that may have come loose during maintenance to prevent powder contamination.

Step 2: Test the build chamber

Insert the build chamber into the printer and start a print. Monitor the build chamber to ensure that the print bed moves smoothly and that the printer dispenses powder into the build chamber normally. Contact Formlabs Support or your certified service provider to share the results of the procedure.