The Fuse X1 uses an infrared sensor to track the temperature of the print bed during a print. Any contamination blocking the IR sensor can lead to inaccurate temperature measurements and print failures.

Clean the IR sensor and purge housing after every 240 hours of printing time (roughly every two weeks), or when indicated by the printer touchscreen.

To clean the IR sensor and purge housing:

1. Open the print chamber door.

2. Use a telescoping mirror wand to locate the inside of the IR sensor purge housing (item 19 in the figure below).

3. Use a polyester swab wetted with ethanol to wipe the inner surface of the purge housing.

4. Using an 8 mm hex driver, unlatch and open the maintenance access door, above the print chamber door.

5. Unlatch the IR sensor from the printer.

6. Remove the IR sensor and use a microfiber cloth wetted with ethanol to wipe the surface of the lens.

7. Place the IR sensor onto its mount and latch it in place.

8. Close the maintenance access door. Latch it shut using an 8 mm hex driver.