The groove mount was where it was so the rather long (44mm) endoscope camera body would sit vertically inside it, and the usb cable from it would end up using the path where the filament/bowden tube normally would go.

Now that I have a version with no endoscope, there is really nothing keeping the groove mount where it is.  I could center it on the part nozzle, or on the body mass, or whatever.

OpenPnP specifies that for ease of setup you should center your coordinate system on the fiducial camera, but it will take an offset for both the nozzle and the camera so....

Centering the mount on the part nozzle would keep any down-pressure generated from pressing the nozzle into the board/bed from creating uneven forces on the arms for a delta.

Centering the mount on the body mass would be the best for avoiding off center moments during acceleration, and would also allow more usable travel near the perimeters.

Or I could just leave it where it is.

I would have to relocate the wire holes to match and reroute the camera ribbon cable if I do move it.

Thinking about it...