Automated nozzle change
Precision drive shaft
Nothing special in this. Remove the old shaft, install the new one. Assembly instructions here.
4k HD cameras
Install new cameras, redo camera related calibrations. First, set focus and direction of the downlooking camera as described here.
The new camera mount has the camera in different place than the old one. To keep home mark where it is and therefore the tapes, nozzle etc coordinates unchanged, you can change the amount of TinyG travel after switch clearance: The parameter to change is called x/y zero backoff ($xzb / $yzb).
Forst, do mechanical homing by clicking individual home buttons on the basic setup page. Jog the camera to position that the old homing mark is in top right quadrant of the camera image. Make note how much you needed to jog. For Y axis, send text “$yzb” (without quotes). TinyG responds with the current value (default 2). If you jogged 22mm, you need to add 22mm to the parameter; to set the new value, send text “$yzb=24”.
Uplooking camera install is similar to the old model. Instructions are here.