by twehr » Sun Aug 14, 2011 3:13 pm
I have seen the same thing, on occasion. It is not so much a test of the controller accuracy as it is a test of your entire mechanical system. I believe the controller is doing exactly as it is instructed. The mechanics, however, may not be able to make very short fast changes of directions without some slippage, skippage, or stretching.
Try it at a different speed. Chances are that it will not be off in exactly the same places. That likely indicates mechanical. If it is always off exactly the same place by exactly the same amount, regardless of the speed you are running, then it could be the controller's ability, but 1000dpi capability should be accurate enough for any job your are doing.