The LevelSense board is located directly behind the resin tank. It senses the position of a metal float in the resin tank to determine the amount of resin in the resin tank. The printer may display Resin Level Sensor Error if there is an issue with the float or the LevelSense board.

If the printer displays Resin Level Sensor Error, follow each step to see if that step resolves the error:

1. Ensure that the printer is level.
2. Inspect the resin tank:
   • Remove the resin tank.
   • Check that the float can move freely.
   • Reinsert and push the tank all the way back. The touchscreen displays a confirmation message when the resin tank is properly seated.
3. Inspect the LevelSense board:
   • Remove the resin tank.
   • Inspect the LevelSense board. Contact Formlabs Support or your authorized reseller if you see damage.
4. Recalibrate the LevelSense board:
   • Tap the wrench icon on the printer’s touchscreen. The Settings screen appears.
   • Tap Maintenance. The Maintenance screen appears.
   • Tap Calibration > Resin Level Calibration.
   • Follow the on-screen instructions:
     • Tap Next to start the calibration process.
     • Remove the resin tank from the printer (if one is inserted) and tap Next.
     • Close the printer cover and tap Calibrate.
     • Once the calibration process is complete, tap Done.
5. If the printer still displays the error, try a different resin tank. If the error does not occur with a different tank, the problem may be with the resin tank.