This is a remix of the Original Bondtech BMG Upgrade extruder to integrate the new MK3S filament sensor.
I did also some modifications to be friendly printable with FDM printer.
It has 4 point screws to install the stepper motor instead of 3 like the original from Bondtech (edit: restored 3 point screws)
I included n°2 versions of the sensor's cover to use with PC4-M6 or PC4-M10.
This design include the Bear X_carriage modified, for more info look at https://github.com/gregsaun/bear_extruder_and_x_axis/tree/master/optional_parts/bondtech_x_carriage

For the Zaribo X-carrige you have to use this : https://www.thingiverse.com/thing:3472470

This is the BOM list for the internal part:

1x Prusa MK3 to MK3S upgrade https://shop.prusa3d.com/en/printer-upgrades/898-original-prusa-i3-mk3-to-mk3s-upgrade-kit.html
1x Shaft Assembly https://www.bondtech.se/en/product/shaft-assembly
2x Ball Bearing 5x8x2.5 https://www.bondtech.se/en/product/ballbearing-5x8x2-5/
1x Motor Gear https://www.bondtech.se/en/product/motor-gear/
1x 3X32 mm Shaft https://www.bondtech.se/en/product/shafts/
1x Thread insert https://www.bondtech.se/en/product/thread-inserts/
1x Thumbscrew Assembly https://www.bondtech.se/en/product-category/spare-parts/thumbscrew-assembly/
1x 1.75 / 5.0 Bontech Drivergear kit. (No need if you own a MK3)
1x pancake motor with at least 16N.cm https://zaribo.com/stepper-motors/126-zaribo-pancake-motor-by-ldo.html

Thanks to Bondtech AB, Grégoire Saunier and all team who developed this great extruder!!

Mixed from the original extruder design: https://github.com/BondtechAB
and for the X carriage from: https://github.com/gregsaun

UPDATE 1 05/03/19 *** I added a version of the extruder body with a square nut instead of the M3 threaded insert , if you choose to print this version you have to use in combination with "Hinge with 2 mm recession". Added Step files.

UPDATE 2 05/03/19 *** new sensor cover, please print this version, in the previous i missed the hole for the screw of sensor, sorry!!

UPDATE 3 20/03/19 *** corrected the filament path after the sensor. (thanks to Gabe Condrea).

UPDATE 23/03/19 ** some minor changes on the extruder path and the filament sensor section. Added file lever.stl instead to download from my .step file

UPDATE 14/04/19 ** Removed the fourth hole screw because it was unusable without special screw.

UPDATE 16/05/19 ** Added the "Square method" in some part where the holes are printed in vertical without support. Thanks to "curt_darius".