U1 Video Guide: Filament Runout Sensor Replacement If the screen still shows No Filament after loading, or Loaded after unloading, the filament runout sensor is likely faulty and needs to be replaced. Follow this guide to replace the filament runout sensor. Part 1: Remove Toolhead Part 2: Replace Filament Runout Sensor Part 3: Restore Toolhead Once replaced, perform a quick test print to confirm the new sensor works correctly. 🛒 Find U1's Replacement Parts: https://bit.ly/4qgyzT5 🛒 Get the #Sn