Hey Carmen,
are you planning to mill one out of aluminum or 3D print one out of plastic?
If it is so important for you to stick to the 65 mm spindle, why would you want to lose the advantage that with the 65 mm mount, the center of gravity of the milling motor is so close to the Z rails? In addition, the existing 65 mm mount is machined extremely precise, which cannot easily be reproduced with consumer capabilities.
You could keep both if you moved the stepper coupler cage upwards instead. This would not require as much precision as when drilling and honing the ducts for the linear bearings and for the ball nut in the spindle mount. And the drive shaft for the ball screw can be extended relatively easily with an extension and with another coupler.
E.g. this this thingiverse project presents taller stepper mounting blocks.
There is also another, much simpler solution. If you obviously accept that you move the center of gravity of the milling motor away from the Z-Rails, you could take the Onefinity 80 mm mount and make a reduction adapter to mount a 65 mm spindle in it. The center point does not have to be in the middle, but closer to the Z axis.
The advantage of the Onefinity 80 mm mount is that it is machined with a high level of precision regarding the seats of the linear bearings and the ball nut. Also its greater height (2″ (51 mm) on 80 mm mount vs. 1.5″ (38.2 mm) height on 65 mm mount – Z linear bearing is 2.75″ (70 mm) long) encompasses the linear bearings over a larger area.
And this way you are already equipped for a later spindle upgrade.
Tags: 80mm mount, 80 mm mount, 65mm mount, 65 mm mount, spindle mount,
80mm Spindle Mount Announcement