https://www.youtube.com/watch?v=8ZL2A7iG7BI print head replacement
https://www.youtube.com/watch?v=WiAj2sBzqhw Prepare the filament to load.
https://www.youtube.com/watch?v=LetdY48O0B8 How to load material
https://www.youtube.com/watch?v=BUKKEP-lFe4 How to unload material
https://www.youtube.com/watch?v=XoRJdHTEclo How to trouble shoot a loading issue
https://www.youtube.com/watch?v=H2TqhZ2pFOA How to replace a material tray