I found this extruder on Aliexpress, and it is very cheap (from Haldis), i decided to try it, due to the fact that uses a IDGA-RIDGA similar approach. It means that the gears has not shaft tollerance problem, so it is a good option for a low issue artifact.
I tested it and i liked it, so i decided to design a carriage for my project, the Black Phantom. It is also suitable for Mk3s X WITH LINEAR RAIL, with Filament Sensor.
The design is in Beta, i'm actually testing it, for now i upload only the Step file, i will ad the STLs when i will end my test-improvement. If you wanna try-test it feel free to use the step file and print the parts.

UPDATE 1 : STLs uploaded

HGX extruded
https://s.click.aliexpress.com/e/_DCi4H8R

BOM

HGT Extruder.
3x m3 30mm Bolt for the extruder part.
Square nut (slim)
3x m3 10mm Bolt
2x M3 35mm Bolt
2x M3 20mm Bolt
4x M3 6mm Bolt