This model is a tube guide upgrade on the X1 to help with filament errors during material switch. Ideally, the material should be high strength and resistant to creep under long exposure to high temperatures. I gave it enough support structure to work with PLA, but PLA will creep over time. For best results, try a material resistant to heat: PC, PA6-GF, PET-CF, PAHT-CF, PA6-CF.