Phil, Robert, and Kevin,
Belts are OK, no damage no missing teeth seen. Wheels were OK, although did adjust one one of "X" carriage - a little loose. No binding, all carriages track smoothly.
All geared wheels of stepper motors are tight and fixed with LocTite.
Problem occurs over entire cutting surface, have tried test cuts of a circle over several locations, same result.
Checked pots, all OK.
I reinitialized my "Easel Local". Reset machine settings through Easel.
Have not reprogrammed my Grble yet, guy at Inventables offered to help me do that next week.
So, having done all the above I retested and the problem remains. See photos below, the test is a simple circle. 1st cut starts at the outside and works into the centre. 2nd cut starts at the center and works out, and you can see that the final cut is shifted a little to the right. The 3rd cut is from outside to center and again you can see the shift again to the right, and the right edge is not cutting one layer, but rather all threelayers at once...
All this is from a machine that was working great to having this recurring problem, any further suggestions will be appreciated.
completion 1st cut
3rd cut from above, note cut is moving to the right.