the flexible ring is out of flexible filament. Every other part can be print out of PLA. For the flexible Filament I used Innoflex45 from Innofil3d to print: 1xouter ring 1xmain plate 2xouter ring stop 2xflexbile ring Part list: 5 M3x5 thread inserts 3 M3x30 2 M3x6 For the installation disconnect the electric plug. Mount the main plate in the position of the original Extruder Use the orignal screw and a nut on the other side. Mount the outer PLA ring to the main plate. But one of the outer ring stops over the shaft. Place the two flexible ring parts around the extruder gear box and insert the pack in the outer ring. Place the outer ring stop on the other side an screw all together.