The Form Wash L impellers are held onto the impeller motors with magnets. If something knocks the impellers loose, the bucket is not lined up properly, or the stir magnets and impeller magnets are not strongly coupled together, the impellers may briefly decouple from the motors, then recouple.

• Something knocks the impeller loose from the motor
• Bucket not lined up properly
• Marginal coupling between stir magnets and impeller magnets

• Clicking or rattling sound when the Form Wash L motor is running
• Buzzing sound when the Form Wash L motor is running

1. Check for debris in the wash bucket that may be obstructing the impeller.
2. Push the wash bucket all the way to the back of the machine to ensure it is seated properly.
3. Remove the wash basket to see if it is interfering with the impeller.
4. If the issue persists, you can do any of the following:
• Continue to use the Form Wash L to wash your parts—the machine will not be damaged by these impeller issues.
• Print and install a set of shims to raise the motors and improve the coupling between the stir magnets and impeller magnets.
• Replace the wash bucket. Contact Formlabs Support or your authorized reseller.

If you contact Formlabs Support or your authorized reseller about this issue, please provide the following information:

• A video of the Form Wash L running with sound
• A photo showing how full the wash bucket was when you encountered the issue, if not clear from the video
• Photo of the wash bucket serial number, located in the bottom-right corner of the rear of the bucket
• Wash bucket flatness measurement
• A photo of the impellers with their center caps removed, showing the six magnets in each impeller. If any of the magnets are tilted, do not push them back into place before taking the picture—show the magnets as they were when the unit was in use.

To measure the flatness of your wash bucket:

1. Empty the wash bucket.
2. Remove the wash bucket from the Form Wash L.
3. Remove the inner lid assembly from the wash bucket.
4. Turn the wash bucket upside down and place it on a flat surface.
5. Place a straight edge across the bottom of the wash bucket, corner to corner.
6. Measure the widest gap between the straight edge and the bottom of the wash bucket.