Bondtech QR Extruder Series

Including QR and QR-M, standard and mirrored versions

1.75 and 2.85mm filament feeders with 1.75/8.00 or 3.0/8.0mm drive gears

All these extruders feature Bondtech Dual Drive technology, and use hardened steel drive gears.
E-steps value @16 microsteps is 476.5 for 1.75mm versions and 492.45 for 2.85mm versions.