Hi,
I recently bought a Raise 3D N2 Plus with the dual extruder. I have encountered the issue with the dual extruder dragging and hitting the print. I in the process of further adjustments to try to get rid of that problem but I am not there yet. I did remove one of the extruders and made a print with that and everything worked fine. Other than a few other minor details, the dual dragging problem is my only complaint.
I can’t comment on the Bontech extruder stuff.
Looks like you posted a while ago but hope that helps.
Thanks