This replaces the housing core part of the Annex Engineering's Sherpa Mini Release 2 extruder to accept an Triangle-Lab collets for the reverse Bowden feed.
Triangle-Lab collets
https://s.click.aliexpress.com/e/_DmPyj87
Print Settings
No supports
ABS or PC
Settings: 0.2mm layer height, 0.4mm nozzle, 5 walls, 5 top and bottom layers, min 40% infill.
The author remixed this model.
The Triangle-Lab collets can be used to securely hold the reverse Bowden tubes in place.