You might take a look at this topic: Lead screw/travel problems, Circles aren’t circles, and I’m a noob
Many of us have had this problem at one time or another. Without all the detail,
- I would first suspect that the couplers that hold the lead screws are not secure/tight enough.
- Do you notice any drag or hiccup with movement when you are moving the gantry on a slow setting like 50 ipm? If you do, perhaps the lead screws need some lubrication (mineral oil or silicone spray). If you use silicone spray wait for it to thoroughly dry before using the machine and project any electronic contacts from spray getting on them (limit switches, and z carriage if you have the THC.
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