Head over to my youtube channel for a short vid on the engraving test I ran with the new spindle, rails and Z assembly.
I still can't get the homing sequence right, so just resorting to jogging to the zero positions.
I also had a small issue of CamBam inserting G-codes into the output file that grbl doesn't support, but that was a 'user' problem and simply changing some option under the CamBam config.
Note: If you upgrade grbl on the Arduino...just don't forget that all your custom settings will be back to the standard defaults. So when your X/Y/Z starts heading off way too far...just remember your steps/mm setting. I'm using nema17 2.5A steppers at 200 steps per revolution, and 6mm x 1mm pitch threaded rod..so one rev = 200 steps = 1mm. Grbl is 250 steps by default. Doh!