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What motor are you using, and are you using a hand controller or software to move the focuser motor?
If you are using software, the driver might be stopping the motor once it "thinks" the step count is at 0. Let's say your full focuser travel is 20,000 steps of the motor. So if fully racked in the count is 0 and fully racked out the count is 20,000.
Now, let's say if your focuser is racked all the way OUT the motor thinks it is at 10,000 steps, so when you bring it in, once the software reaches 0 it will stop.
Just a thought as this has happened to me. It's irrelevant if you are using a hand controller.
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