Need help with calibration

[madgrizzle]

Chain skip is a definite possibility.

How To: Manually Reset Chains, the Easy Way

Every now and then you may find that you need to readjust the chains back to a known position. This could occur if you power/connection issue and the controller lost it’s position, had a chain skip, took apart something for some reason, etc… Fortunately, there’s a way to reset the chains without a lot of work. During calibration, after you set the sprockets vertical, you extend the chains out to reconnect to the sled. If your “Extend Chain Distance” is a multiple of a full revolution of the s…

Also, it often helps to run the calibration multiple times (2… sometimes 3 times) as each time it improves the accuracy of the machine, but the improvement diminishes with each calibration as it gets closer and closer to the optimum solution.