A simple wheel with a rolling pin for extruders with 5mm shafts.
For fast filament charge and discharge in bowden setup (disabling stepper motors)!
You wil need an M3 bolt to secure the washer.
If you have tolerance problem you can upscale the wheel or downscale the pin by 0.5-2% in X and Y directions (not Z).
To push the wheel in the shaft you may use GENTLY a small clamp.