Ultimaker Feeder Upgrade, Upgrade :)

thingiverse

Create a grooved ring for enhanced filament feed. Avoid sideways filament movement and deformation. Upgrade from Ultimaker's standard delrin ring. Proceed with caution, as it may affect your printer's performance. Assemble with a tight fit; adjustments might be necessary based on your printer's specifications. Consider increasing the outer diameter for better compatibility, but note that this may require altering other parts of the pressure lever.